256156945 has 16 divisors (see below), whose sum is σ = 337401792. Its totient is φ = 185146560.

The previous prime is 256156931. The next prime is 256156973. The reversal of 256156945 is 549651652.

It is not a de Polignac number, because 256156945 - 2²⁷ = 121939217 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5322 + ... + 23251.

It is an arithmetic number, because the mean of its divisors is an integer number (21087612).

Almost surely, 2^256156945 is an apocalyptic number.

It is an amenable number.

256156945 is a deficient number, since it is larger than the sum of its proper divisors (81244847).

256156945 is a wasteful number, since it uses less digits than its factorization.

256156945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28752.

The product of its digits is 324000, while the sum is 43.

The square root of 256156945 is about 16004.9037797795. The cubic root of 256156945 is about 635.0901519141.

The spelling of 256156945 in words is "two hundred fifty-six million, one hundred fifty-six thousand, nine hundred forty-five".