11821968664 has 32 divisors (see below), whose sum is σ = 24314930640. Its totient is φ = 5343926400.

The previous prime is 11821968661. The next prime is 11821968677. The reversal of 11821968664 is 46686912811.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11821968661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355179 + ... + 387034.

Almost surely, 2^11821968664 is an apocalyptic number.

It is an amenable number.

11821968664 is an abundant number, since it is smaller than the sum of its proper divisors (12492961976).

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

11821968664 is a wasteful number, since it uses less digits than its factorization.

11821968664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742411 (or 742407 counting only the distinct ones).

The product of its digits is 995328, while the sum is 52.

The spelling of 11821968664 in words is "eleven billion, eight hundred twenty-one million, nine hundred sixty-eight thousand, six hundred sixty-four".