11601557257 has 4 divisors (see below), whose sum is σ = 11774714896. Its totient is φ = 11428399620.

The previous prime is 11601557249. The next prime is 11601557267. The reversal of 11601557257 is 75275510611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11601557257 - 2³ = 11601557249 is a prime.

It is a super-2 number, since 2×11601557257² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11601557267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86578719 + ... + 86578852.

It is an arithmetic number, because the mean of its divisors is an integer number (2943678724).

Almost surely, 2^11601557257 is an apocalyptic number.

It is an amenable number.

11601557257 is a deficient number, since it is larger than the sum of its proper divisors (173157639).

11601557257 is an equidigital number, since it uses as much as digits as its factorization.

11601557257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173157638.

The product of its (nonzero) digits is 73500, while the sum is 40.

The spelling of 11601557257 in words is "eleven billion, six hundred one million, five hundred fifty-seven thousand, two hundred fifty-seven".