646455104256 has 144 divisors (see below), whose sum is σ = 1853575073280. Its totient is φ = 198832558080.

The previous prime is 646455104221. The next prime is 646455104357. The reversal of 646455104256 is 652401554646.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29331961 + ... + 29353991.

It is an arithmetic number, because the mean of its divisors is an integer number (12872049120).

Almost surely, 2^646455104256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646455104256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (926787536640).

646455104256 is an abundant number, since it is smaller than the sum of its proper divisors (1207119969024).

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

646455104256 is a wasteful number, since it uses less digits than its factorization.

646455104256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25002 (or 24988 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 48.

The spelling of 646455104256 in words is "six hundred forty-six billion, four hundred fifty-five million, one hundred four thousand, two hundred fifty-six".