256541431166 has 16 divisors (see below), whose sum is σ = 386208286800. Its totient is φ = 127805895360.

The previous prime is 256541431043. The next prime is 256541431217. The reversal of 256541431166 is 661134145652.

It is a super-2 number, since 2×256541431166² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 782945 + ... + 1061171.

It is an arithmetic number, because the mean of its divisors is an integer number (24138017925).

Almost surely, 2^256541431166 is an apocalyptic number.

256541431166 is a deficient number, since it is larger than the sum of its proper divisors (129666855634).

256541431166 is a wasteful number, since it uses less digits than its factorization.

256541431166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279899.

The product of its digits is 518400, while the sum is 44.

The spelling of 256541431166 in words is "two hundred fifty-six billion, five hundred forty-one million, four hundred thirty-one thousand, one hundred sixty-six".