257332666 has 4 divisors (see below), whose sum is σ = 385999002. Its totient is φ = 128666332.

The previous prime is 257332651. The next prime is 257332697. The reversal of 257332666 is 666233752.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 159896025 + 97436641 = 12645^2 + 9871^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 as a sum of consecutive naturals, namely, 64333165 + ... + 64333168.

Almost surely, 2^257332666 is an apocalyptic number.

257332666 is a deficient number, since it is larger than the sum of its proper divisors (128666336).

257332666 is a wasteful number, since it uses less digits than its factorization.

257332666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128666335.

The product of its digits is 272160, while the sum is 40.

The square root of 257332666 is about 16041.5917539376. The cubic root of 257332666 is about 636.0603244997.

The spelling of 257332666 in words is "two hundred fifty-seven million, three hundred thirty-two thousand, six hundred sixty-six".