256623705351 has 12 divisors (see below), whose sum is σ = 399192430728. Its totient is φ = 157922280144.

The previous prime is 256623705347. The next prime is 256623705413. The reversal of 256623705351 is 153507326652.

256623705351 is a `hidden beast` number, since 2 + 5 + 66 + 237 + 0 + 5 + 351 = 666.

It is not a de Polignac number, because 256623705351 - 2² = 256623705347 is a prime.

It is a super-2 number, since 2×256623705351² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256623705297 and 256623705306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256623701351) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1096682385 + ... + 1096682618.

It is an arithmetic number, because the mean of its divisors is an integer number (33266035894).

Almost surely, 2^256623705351 is an apocalyptic number.

256623705351 is a deficient number, since it is larger than the sum of its proper divisors (142568725377).

256623705351 is a wasteful number, since it uses less digits than its factorization.

256623705351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2193365022 (or 2193365019 counting only the distinct ones).

The product of its (nonzero) digits is 1134000, while the sum is 45.

The spelling of 256623705351 in words is "two hundred fifty-six billion, six hundred twenty-three million, seven hundred five thousand, three hundred fifty-one".