256445451 has 12 divisors (see below), whose sum is σ = 389917320. Its totient is φ = 161965440.

The previous prime is 256445443. The next prime is 256445461. The reversal of 256445451 is 154544652.

256445451 is a `hidden beast` number, since 2 + 5 + 644 + 5 + 4 + 5 + 1 = 666.

It is not a de Polignac number, because 256445451 - 2³ = 256445443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256445411) 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, 749670 + ... + 750011.

It is an arithmetic number, because the mean of its divisors is an integer number (32493110).

Almost surely, 2^256445451 is an apocalyptic number.

256445451 is a deficient number, since it is larger than the sum of its proper divisors (133471869).

256445451 is a wasteful number, since it uses less digits than its factorization.

256445451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499706 (or 1499703 counting only the distinct ones).

The product of its digits is 96000, while the sum is 36.

The square root of 256445451 is about 16013.9142935136. The cubic root of 256445451 is about 635.3284935208.

The spelling of 256445451 in words is "two hundred fifty-six million, four hundred forty-five thousand, four hundred fifty-one".