256155511 has 12 divisors (see below), whose sum is σ = 278635800. Its totient is φ = 234828720.

The previous prime is 256155491. The next prime is 256155517. The reversal of 256155511 is 115551652.

It is not a de Polignac number, because 256155511 - 2⁵ = 256155479 is a prime.

It is a super-2 number, since 2×256155511² = 131231291631342242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256155517) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11245 + ... + 25273.

It is an arithmetic number, because the mean of its divisors is an integer number (23219650).

Almost surely, 2^256155511 is an apocalyptic number.

256155511 is a deficient number, since it is larger than the sum of its proper divisors (22480289).

256155511 is a wasteful number, since it uses less digits than its factorization.

256155511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14110 (or 14079 counting only the distinct ones).

The product of its digits is 7500, while the sum is 31.

The square root of 256155511 is about 16004.8589809470. The cubic root of 256155511 is about 635.0889668060.

The spelling of 256155511 in words is "two hundred fifty-six million, one hundred fifty-five thousand, five hundred eleven".