256999877652 has 96 divisors (see below), whose sum is σ = 716746770432. Its totient is φ = 70077211776.

The previous prime is 256999877647. The next prime is 256999877737. The reversal of 256999877652 is 256778999652.

It is a super-2 number, since 2×256999877652² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 705738 + ... + 1006014.

It is an arithmetic number, because the mean of its divisors is an integer number (7466112192).

Almost surely, 2^256999877652 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 256999877652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (358373385216).

256999877652 is an abundant number, since it is smaller than the sum of its proper divisors (459746892780).

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

256999877652 is a wasteful number, since it uses less digits than its factorization.

256999877652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300757 (or 300755 counting only the distinct ones).

The product of its digits is 1028764800, while the sum is 75.

The spelling of 256999877652 in words is "two hundred fifty-six billion, nine hundred ninety-nine million, eight hundred seventy-seven thousand, six hundred fifty-two".