6851861280 has 576 divisors, whose sum is σ = 27230007168. Its totient is φ = 1612431360.

The previous prime is 6851861279. The next prime is 6851861281. The reversal of 6851861280 is 821681586.

6851861280 is a `hidden beast` number, since 6 + 8 + 518 + 6 + 128 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (6851861279) and next prime (6851861281).

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 (6851861281) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15823944 + ... + 15824376.

It is an arithmetic number, because the mean of its divisors is an integer number (47274318).

Almost surely, 2^6851861280 is an apocalyptic number.

6851861280 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 6851861280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13615003584).

6851861280 is an abundant number, since it is smaller than the sum of its proper divisors (20378145888).

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

6851861280 is a wasteful number, since it uses less digits than its factorization.

6851861280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511 (or 491 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The square root of 6851861280 is about 82775.9704262052. The cubic root of 6851861280 is about 1899.3406095984.

The spelling of 6851861280 in words is "six billion, eight hundred fifty-one million, eight hundred sixty-one thousand, two hundred eighty".