256528180927155 has 64 divisors (see below), whose sum is σ = 446747013024768. Its totient is φ = 125214376734720.

The previous prime is 256528180927063. The next prime is 256528180927163. The reversal of 256528180927155 is 551729081825652.

It is not a de Polignac number, because 256528180927155 - 2¹² = 256528180923059 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 95725689 + ... + 98369018.

It is an arithmetic number, because the mean of its divisors is an integer number (6980422078512).

Almost surely, 2^{256528180927155} is an apocalyptic number.

256528180927155 is a deficient number, since it is larger than the sum of its proper divisors (190218832097613).

256528180927155 is a wasteful number, since it uses less digits than its factorization.

256528180927155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194094876.

The product of its (nonzero) digits is 120960000, while the sum is 66.

The spelling of 256528180927155 in words is "two hundred fifty-six trillion, five hundred twenty-eight billion, one hundred eighty million, nine hundred twenty-seven thousand, one hundred fifty-five".