11821623564 has 24 divisors (see below), whose sum is σ = 27686337840. Its totient is φ = 3925891264.

The previous prime is 11821623533. The next prime is 11821623589. The reversal of 11821623564 is 46532612811.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1827879 + ... + 1834334.

It is an arithmetic number, because the mean of its divisors is an integer number (1153597410).

Almost surely, 2^11821623564 is an apocalyptic number.

It is an amenable number.

11821623564 is an abundant number, since it is smaller than the sum of its proper divisors (15864714276).

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

11821623564 is a wasteful number, since it uses less digits than its factorization.

11821623564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3662489 (or 3662487 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The spelling of 11821623564 in words is "eleven billion, eight hundred twenty-one million, six hundred twenty-three thousand, five hundred sixty-four".