256651432551 has 32 divisors (see below), whose sum is σ = 397660032000. Its totient is φ = 163288803744.

The previous prime is 256651432523. The next prime is 256651432573. The reversal of 256651432551 is 155234156652.

256651432551 is a `hidden beast` number, since 2 + 5 + 6 + 6 + 51 + 43 + 2 + 551 = 666.

It is not a de Polignac number, because 256651432551 - 2⁹ = 256651432039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256651432497 and 256651432506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256651433551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 198096 + ... + 743333.

It is an arithmetic number, because the mean of its divisors is an integer number (12426876000).

Almost surely, 2^256651432551 is an apocalyptic number.

256651432551 is a deficient number, since it is larger than the sum of its proper divisors (141008599449).

256651432551 is a wasteful number, since it uses less digits than its factorization.

256651432551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941900 (or 941894 counting only the distinct ones).

The product of its digits is 1080000, while the sum is 45.

The spelling of 256651432551 in words is "two hundred fifty-six billion, six hundred fifty-one million, four hundred thirty-two thousand, five hundred fifty-one".