256069974545 has 32 divisors (see below), whose sum is σ = 385113194496. Its totient is φ = 158792241600.

The previous prime is 256069974493. The next prime is 256069974571. The reversal of 256069974545 is 545479960652.

It is not a de Polignac number, because 256069974545 - 2²⁰ = 256068925969 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1667609 + ... + 1814678.

It is an arithmetic number, because the mean of its divisors is an integer number (12034787328).

Almost surely, 2^256069974545 is an apocalyptic number.

It is an amenable number.

256069974545 is a deficient number, since it is larger than the sum of its proper divisors (129043219951).

256069974545 is a wasteful number, since it uses less digits than its factorization.

256069974545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3482501.

The product of its (nonzero) digits is 81648000, while the sum is 62.

The spelling of 256069974545 in words is "two hundred fifty-six billion, sixty-nine million, nine hundred seventy-four thousand, five hundred forty-five".