1268957657 has 8 divisors (see below), whose sum is σ = 1388688192. Its totient is φ = 1149955600.

The previous prime is 1268957623. The next prime is 1268957713. The reversal of 1268957657 is 7567598621.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1268957657 is a prime.

It is a super-2 number, since 2×1268957657² = 3220507070517859298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1268957857) 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, 178469 + ... + 185442.

It is an arithmetic number, because the mean of its divisors is an integer number (173586024).

Almost surely, 2^1268957657 is an apocalyptic number.

It is an amenable number.

1268957657 is a deficient number, since it is larger than the sum of its proper divisors (119730535).

1268957657 is a wasteful number, since it uses less digits than its factorization.

1268957657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364239.

The product of its digits is 6350400, while the sum is 56.

The square root of 1268957657 is about 35622.4319355094. The cubic root of 1268957657 is about 1082.6357822589.

The spelling of 1268957657 in words is "one billion, two hundred sixty-eight million, nine hundred fifty-seven thousand, six hundred fifty-seven".