11557862557 has 4 divisors (see below), whose sum is σ = 11567117500. Its totient is φ = 11548607616.

The previous prime is 11557862513. The next prime is 11557862579. The reversal of 11557862557 is 75526875511.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7121503321 + 4436359236 = 84389^2 + 66606^2 .

It is a cyclic number.

It is not a de Polignac number, because 11557862557 - 2¹⁹ = 11557338269 is a prime.

It is the 107508-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11557862597) by changing a digit.

It is a nontrivial repunit in base 107507.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4625598 + ... + 4628095.

It is an arithmetic number, because the mean of its divisors is an integer number (2891779375).

Almost surely, 2^11557862557 is an apocalyptic number.

It is an amenable number.

11557862557 is a deficient number, since it is larger than the sum of its proper divisors (9254943).

11557862557 is an equidigital number, since it uses as much as digits as its factorization.

11557862557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9254942.

The product of its digits is 2940000, while the sum is 52.

The spelling of 11557862557 in words is "eleven billion, five hundred fifty-seven million, eight hundred sixty-two thousand, five hundred fifty-seven".