256001166 has 24 divisors (see below), whose sum is σ = 554967504. Its totient is φ = 85287840.

The previous prime is 256001153. The next prime is 256001189. The reversal of 256001166 is 661100652.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55210 + ... + 59666.

It is an arithmetic number, because the mean of its divisors is an integer number (23123646).

Almost surely, 2^256001166 is an apocalyptic number.

256001166 is an abundant number, since it is smaller than the sum of its proper divisors (298966338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256001166 is a wasteful number, since it uses less digits than its factorization.

256001166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7656 (or 7653 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 256001166 is about 16000.0364374585. The cubic root of 256001166 is about 634.9613848012.

The spelling of 256001166 in words is "two hundred fifty-six million, one thousand, one hundred sixty-six".