256010772921 has 8 divisors (see below), whose sum is σ = 341352684960. Its totient is φ = 170671354752.

The previous prime is 256010772917. The next prime is 256010772947. The reversal of 256010772921 is 129277010652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256010772921 - 2² = 256010772917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256010772911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 369111 + ... + 805148.

It is an arithmetic number, because the mean of its divisors is an integer number (42669085620).

Almost surely, 2^256010772921 is an apocalyptic number.

It is an amenable number.

256010772921 is a deficient number, since it is larger than the sum of its proper divisors (85341912039).

256010772921 is a wasteful number, since it uses less digits than its factorization.

256010772921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1246935.

The product of its (nonzero) digits is 105840, while the sum is 42.

The spelling of 256010772921 in words is "two hundred fifty-six billion, ten million, seven hundred seventy-two thousand, nine hundred twenty-one".