257021166 has 32 divisors (see below), whose sum is σ = 529930368. Its totient is φ = 83043360.

The previous prime is 257021137. The next prime is 257021173. The reversal of 257021166 is 661120752.

It is a super-4 number, since 4×257021166⁴ (a number of 35 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60781 + ... + 64871.

It is an arithmetic number, because the mean of its divisors is an integer number (16560324).

Almost surely, 2^257021166 is an apocalyptic number.

257021166 is an abundant number, since it is smaller than the sum of its proper divisors (272909202).

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

257021166 is a wasteful number, since it uses less digits than its factorization.

257021166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4416.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 257021166 is about 16031.8796776922. The cubic root of 257021166 is about 635.8035715137.

The spelling of 257021166 in words is "two hundred fifty-seven million, twenty-one thousand, one hundred sixty-six".