256634632650 has 96 divisors (see below), whose sum is σ = 694944360000. Its totient is φ = 62157913600.

The previous prime is 256634632633. The next prime is 256634632669. The reversal of 256634632650 is 56236436652.

It is a happy number.

It is a super-2 number, since 2×256634632650² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 256634632650.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1759726 + ... + 1899974.

It is an arithmetic number, because the mean of its divisors is an integer number (7239003750).

Almost surely, 2^256634632650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256634632650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (347472180000).

256634632650 is an abundant number, since it is smaller than the sum of its proper divisors (438309727350).

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

256634632650 is a wasteful number, since it uses less digits than its factorization.

256634632650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141384 (or 141379 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 48.

The spelling of 256634632650 in words is "two hundred fifty-six billion, six hundred thirty-four million, six hundred thirty-two thousand, six hundred fifty".