256252155 has 32 divisors (see below), whose sum is σ = 420925440. Its totient is φ = 133073280.

The previous prime is 256252151. The next prime is 256252187. The reversal of 256252155 is 551252652.

It is not a de Polignac number, because 256252155 - 2² = 256252151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256252151) 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, 92886 + ... + 95604.

It is an arithmetic number, because the mean of its divisors is an integer number (13153920).

Almost surely, 2^256252155 is an apocalyptic number.

256252155 is a deficient number, since it is larger than the sum of its proper divisors (164673285).

256252155 is a wasteful number, since it uses less digits than its factorization.

256252155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2891.

The product of its digits is 30000, while the sum is 33.

The square root of 256252155 is about 16007.8779043320. The cubic root of 256252155 is about 635.1688269146.

The spelling of 256252155 in words is "two hundred fifty-six million, two hundred fifty-two thousand, one hundred fifty-five".