257198066 has 8 divisors (see below), whose sum is σ = 408491100. Its totient is φ = 121034368.

The previous prime is 257198033. The next prime is 257198087. The reversal of 257198066 is 660891752.

It can be written as a sum of positive squares in 2 ways, for example, as 256672441 + 525625 = 16021^2 + 725^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3782291 + ... + 3782358.

Almost surely, 2^257198066 is an apocalyptic number.

257198066 is a deficient number, since it is larger than the sum of its proper divisors (151293034).

257198066 is a wasteful number, since it uses less digits than its factorization.

257198066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7564668.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 257198066 is about 16037.3958609246. The cubic root of 257198066 is about 635.9494062703.

The spelling of 257198066 in words is "two hundred fifty-seven million, one hundred ninety-eight thousand, sixty-six".