256552198656 has 160 divisors (see below), whose sum is σ = 759791036928. Its totient is φ = 76392529920.

The previous prime is 256552198621. The next prime is 256552198663. The reversal of 256552198656 is 656891255652.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 256552198656.

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, 411780 + ... + 826236.

Almost surely, 2^256552198656 is an apocalyptic number.

256552198656 is a gapful number since it is divisible by the number (26) 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 256552198656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (379895518464).

256552198656 is an abundant number, since it is smaller than the sum of its proper divisors (503238838272).

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

256552198656 is a wasteful number, since it uses less digits than its factorization.

256552198656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414522 (or 414506 counting only the distinct ones).

The product of its digits is 38880000, while the sum is 60.

The spelling of 256552198656 in words is "two hundred fifty-six billion, five hundred fifty-two million, one hundred ninety-eight thousand, six hundred fifty-six".