13257238857 has 8 divisors (see below), whose sum is σ = 17736648384. Its totient is φ = 8807994288.

The previous prime is 13257238853. The next prime is 13257238867. The reversal of 13257238857 is 75883275231.

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

It is not a de Polignac number, because 13257238857 - 2² = 13257238853 is a prime.

It is a super-2 number, since 2×13257238857² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13257238853) 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, 7540213 + ... + 7541970.

It is an arithmetic number, because the mean of its divisors is an integer number (2217081048).

Almost surely, 2^13257238857 is an apocalyptic number.

It is an amenable number.

13257238857 is a deficient number, since it is larger than the sum of its proper divisors (4479409527).

13257238857 is a wasteful number, since it uses less digits than its factorization.

13257238857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15082479.

The product of its digits is 2822400, while the sum is 51.

The spelling of 13257238857 in words is "thirteen billion, two hundred fifty-seven million, two hundred thirty-eight thousand, eight hundred fifty-seven".