11556331577 has 16 divisors (see below), whose sum is σ = 13789793280. Its totient is φ = 9469030032.

The previous prime is 11556331561. The next prime is 11556331607. The reversal of 11556331577 is 77513365511.

It is a happy number.

It is not a de Polignac number, because 11556331577 - 2⁴ = 11556331561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11556331517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256574 + ... + 298232.

It is an arithmetic number, because the mean of its divisors is an integer number (861862080).

Almost surely, 2^11556331577 is an apocalyptic number.

It is an amenable number.

11556331577 is a deficient number, since it is larger than the sum of its proper divisors (2233461703).

11556331577 is a wasteful number, since it uses less digits than its factorization.

11556331577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43412.

The product of its digits is 330750, while the sum is 44.

The spelling of 11556331577 in words is "eleven billion, five hundred fifty-six million, three hundred thirty-one thousand, five hundred seventy-seven".