11656641123 has 32 divisors (see below), whose sum is σ = 17370240000. Its totient is φ = 7725697056.

The previous prime is 11656641077. The next prime is 11656641131. The reversal of 11656641123 is 32114665611.

11656641123 is a `hidden beast` number, since 1 + 1 + 6 + 5 + 6 + 641 + 1 + 2 + 3 = 666.

It is not a de Polignac number, because 11656641123 - 2²⁶ = 11589532259 is a prime.

It is a super-2 number, since 2×11656641123² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11656641023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5348448 + ... + 5350626.

It is an arithmetic number, because the mean of its divisors is an integer number (542820000).

Almost surely, 2^11656641123 is an apocalyptic number.

11656641123 is a deficient number, since it is larger than the sum of its proper divisors (5713598877).

11656641123 is a wasteful number, since it uses less digits than its factorization.

11656641123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3256 (or 3250 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The spelling of 11656641123 in words is "eleven billion, six hundred fifty-six million, six hundred forty-one thousand, one hundred twenty-three".