21677785632 has 72 divisors (see below), whose sum is σ = 61668262656. Its totient is φ = 7223342976.

The previous prime is 21677785609. The next prime is 21677785667. The reversal of 21677785632 is 23658777612.

It is a happy number.

21677785632 is a `hidden beast` number, since 2 + 1 + 6 + 7 + 7 + 78 + 563 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 900213 + ... + 923979.

It is an arithmetic number, because the mean of its divisors is an integer number (856503648).

Almost surely, 2^21677785632 is an apocalyptic number.

It is an amenable number.

21677785632 is an abundant number, since it is smaller than the sum of its proper divisors (39990477024).

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

21677785632 is a wasteful number, since it uses less digits than its factorization.

21677785632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26950 (or 26939 counting only the distinct ones).

The product of its digits is 5927040, while the sum is 54.

The spelling of 21677785632 in words is "twenty-one billion, six hundred seventy-seven million, seven hundred eighty-five thousand, six hundred thirty-two".