18640621432 has 16 divisors (see below), whose sum is σ = 35763983640. Its totient is φ = 9103559136.

The previous prime is 18640621399. The next prime is 18640621453. The reversal of 18640621432 is 23412604681.

It is a super-2 number, since 2×18640621432² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18640621391 and 18640621400.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27093583 + ... + 27094270.

Almost surely, 2^18640621432 is an apocalyptic number.

It is an amenable number.

18640621432 is a deficient number, since it is larger than the sum of its proper divisors (17123362208).

18640621432 is a wasteful number, since it uses less digits than its factorization.

18640621432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54187902 (or 54187898 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 37.

The spelling of 18640621432 in words is "eighteen billion, six hundred forty million, six hundred twenty-one thousand, four hundred thirty-two".