257156912690 has 16 divisors (see below), whose sum is σ = 463191264000. Its totient is φ = 102794138160.

The previous prime is 257156912681. The next prime is 257156912693. The reversal of 257156912690 is 96219651752.

It is a super-2 number, since 2×257156912690² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (257156912693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8562626 + ... + 8592605.

It is an arithmetic number, because the mean of its divisors is an integer number (28949454000).

Almost surely, 2^257156912690 is an apocalyptic number.

257156912690 is a deficient number, since it is larger than the sum of its proper divisors (206034351310).

257156912690 is a wasteful number, since it uses less digits than its factorization.

257156912690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17156737.

The product of its (nonzero) digits is 2041200, while the sum is 53.

The spelling of 257156912690 in words is "two hundred fifty-seven billion, one hundred fifty-six million, nine hundred twelve thousand, six hundred ninety".