256166677 has 16 divisors (see below), whose sum is σ = 279805680. Its totient is φ = 233114112.

The previous prime is 256166639. The next prime is 256166681. The reversal of 256166677 is 776661652.

256166677 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 4024036 + 252142641 = 2006^2 + 15879^2 .

It is a cyclic number.

It is not a de Polignac number, because 256166677 - 2¹⁵ = 256133909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256164677) 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, 414873 + ... + 415489.

It is an arithmetic number, because the mean of its divisors is an integer number (17487855).

Almost surely, 2^256166677 is an apocalyptic number.

It is an amenable number.

256166677 is a deficient number, since it is larger than the sum of its proper divisors (23639003).

256166677 is a wasteful number, since it uses less digits than its factorization.

256166677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032.

The product of its digits is 635040, while the sum is 46.

The square root of 256166677 is about 16005.2078087103. The cubic root of 256166677 is about 635.0981946644.

The spelling of 256166677 in words is "two hundred fifty-six million, one hundred sixty-six thousand, six hundred seventy-seven".