256195155 has 16 divisors (see below), whose sum is σ = 410138784. Its totient is φ = 136561920.

The previous prime is 256195153. The next prime is 256195217. The reversal of 256195155 is 551591652.

It is not a de Polignac number, because 256195155 - 2¹ = 256195153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256195153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33117 + ... + 40113.

It is an arithmetic number, because the mean of its divisors is an integer number (25633674).

Almost surely, 2^256195155 is an apocalyptic number.

256195155 is a deficient number, since it is larger than the sum of its proper divisors (153943629).

256195155 is a wasteful number, since it uses less digits than its factorization.

256195155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9446.

The product of its digits is 67500, while the sum is 39.

The square root of 256195155 is about 16006.0974319164. The cubic root of 256195155 is about 635.1217283736.

The spelling of 256195155 in words is "two hundred fifty-six million, one hundred ninety-five thousand, one hundred fifty-five".