6851515680 has 192 divisors, whose sum is σ = 24126439680. Its totient is φ = 1815939072.

The previous prime is 6851515679. The next prime is 6851515681. The reversal of 6851515680 is 865151586.

6851515680 is a `hidden beast` number, since 6 + 8 + 51 + 515 + 6 + 80 = 666.

It is an interprime number because it is at equal distance from previous prime (6851515679) and next prime (6851515681).

It is a super-2 number, since 2×6851515680² = 93886534226571724800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (6851515681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 716692 + ... + 726188.

It is an arithmetic number, because the mean of its divisors is an integer number (125658540).

Almost surely, 2^6851515680 is an apocalyptic number.

6851515680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6851515680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12063219840).

6851515680 is an abundant number, since it is smaller than the sum of its proper divisors (17274924000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6851515680 is a wasteful number, since it uses less digits than its factorization.

6851515680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9688 (or 9674 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 45.

The square root of 6851515680 is about 82773.8828375231. The cubic root of 6851515680 is about 1899.3086755431.

The spelling of 6851515680 in words is "six billion, eight hundred fifty-one million, five hundred fifteen thousand, six hundred eighty".