11156661131 has 12 divisors (see below), whose sum is σ = 14014980336. Its totient is φ = 8693501520.

The previous prime is 11156661121. The next prime is 11156661157. The reversal of 11156661131 is 13116665111.

It is not a de Polignac number, because 11156661131 - 2¹⁴ = 11156644747 is a prime.

It is a super-2 number, since 2×11156661131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11156661121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6585140 + ... + 6586833.

It is an arithmetic number, because the mean of its divisors is an integer number (1167915028).

Almost surely, 2^11156661131 is an apocalyptic number.

11156661131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11156661131 is a deficient number, since it is larger than the sum of its proper divisors (2858319205).

11156661131 is a wasteful number, since it uses less digits than its factorization.

11156661131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13172002 (or 13171991 counting only the distinct ones).

The product of its digits is 3240, while the sum is 32.

The spelling of 11156661131 in words is "eleven billion, one hundred fifty-six million, six hundred sixty-one thousand, one hundred thirty-one".