6645862080 has 840 divisors, whose sum is σ = 28155540336. Its totient is φ = 1478062080.

The previous prime is 6645862079. The next prime is 6645862081. The reversal of 6645862080 is 802685466.

6645862080 is a `hidden beast` number, since 6 + 64 + 586 + 2 + 0 + 8 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (6645862079) and next prime (6645862081).

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 (6645862081) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 40772079 + ... + 40772241.

Almost surely, 2^6645862080 is an apocalyptic number.

6645862080 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 6645862080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14077770168).

6645862080 is an abundant number, since it is smaller than the sum of its proper divisors (21509678256).

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

6645862080 is a wasteful number, since it uses less digits than its factorization.

6645862080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The square root of 6645862080 is about 81522.1569881465. The cubic root of 6645862080 is about 1880.1122311150.

It can be divided in two parts, 664586 and 2080, that added together give a palindrome (666666).

The spelling of 6645862080 in words is "six billion, six hundred forty-five million, eight hundred sixty-two thousand, eighty".