11656405665320 has 128 divisors (see below), whose sum is σ = 28669090060800. Its totient is φ = 4239198222336.

The previous prime is 11656405665293. The next prime is 11656405665431. The reversal of 11656405665320 is 2356650465611.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 554607452 + ... + 554628468.

It is an arithmetic number, because the mean of its divisors is an integer number (223977266100).

Almost surely, 2^{11656405665320} is an apocalyptic number.

11656405665320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11656405665320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14334545030400).

11656405665320 is an abundant number, since it is smaller than the sum of its proper divisors (17012684395480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11656405665320 is a wasteful number, since it uses less digits than its factorization.

11656405665320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37027 (or 37023 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 50.

The spelling of 11656405665320 in words is "eleven trillion, six hundred fifty-six billion, four hundred five million, six hundred sixty-five thousand, three hundred twenty".