11656212813 has 12 divisors (see below), whose sum is σ = 19242002208. Its totient is φ = 6660693000.

The previous prime is 11656212791. The next prime is 11656212839. The reversal of 11656212813 is 31821265611.

11656212813 is a `hidden beast` number, since 1 + 1 + 6 + 5 + 621 + 28 + 1 + 3 = 666.

It is not a de Polignac number, because 11656212813 - 2¹⁴ = 11656196429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11656212313) 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, 92509563 + ... + 92509688.

It is an arithmetic number, because the mean of its divisors is an integer number (1603500184).

Almost surely, 2^11656212813 is an apocalyptic number.

It is an amenable number.

11656212813 is a deficient number, since it is larger than the sum of its proper divisors (7585789395).

11656212813 is a wasteful number, since it uses less digits than its factorization.

11656212813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185019264 (or 185019261 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The spelling of 11656212813 in words is "eleven billion, six hundred fifty-six million, two hundred twelve thousand, eight hundred thirteen".