256166667 has 12 divisors (see below), whose sum is σ = 373478040. Its totient is φ = 169181088.

The previous prime is 256166639. The next prime is 256166681. The reversal of 256166667 is 766661652.

256166667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 256166667 - 2⁷ = 256166539 is a prime.

It is a super-2 number, since 2×256166667² = 131242722563777778, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256166167) 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, 132042 + ... + 133967.

It is an arithmetic number, because the mean of its divisors is an integer number (31123170).

Almost surely, 2^256166667 is an apocalyptic number.

256166667 is a deficient number, since it is larger than the sum of its proper divisors (117311373).

256166667 is a wasteful number, since it uses less digits than its factorization.

256166667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266122 (or 266119 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 256166667 is about 16005.2074963119. The cubic root of 256166667 is about 635.0981864003.

The spelling of 256166667 in words is "two hundred fifty-six million, one hundred sixty-six thousand, six hundred sixty-seven".