11656421456664 has 32 divisors (see below), whose sum is σ = 30855233268720. Its totient is φ = 3656916535296.

The previous prime is 11656421456663. The next prime is 11656421456683. The reversal of 11656421456664 is 46665412465611.

It is a super-2 number, since 2×11656421456664² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11656421456663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14284829809 + ... + 14284830624.

Almost surely, 2^{11656421456664} is an apocalyptic number.

It is an amenable number.

11656421456664 is an abundant number, since it is smaller than the sum of its proper divisors (19198811812056).

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

11656421456664 is a wasteful number, since it uses less digits than its factorization.

11656421456664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28569660459 (or 28569660455 counting only the distinct ones).

The product of its digits is 24883200, while the sum is 57.

The spelling of 11656421456664 in words is "eleven trillion, six hundred fifty-six billion, four hundred twenty-one million, four hundred fifty-six thousand, six hundred sixty-four".