18949724964 has 27 divisors (see below), whose sum is σ = 47902781563. Its totient is φ = 6316299672.

The previous prime is 18949724957. The next prime is 18949724977. The reversal of 18949724964 is 46942794981.

The square root of 18949724964 is 137658.

It is a perfect power (a square), and thus also a powerful number.

18949724964 is a `hidden beast` number, since 1 + 89 + 497 + 2 + 4 + 9 + 64 = 666.

It is a super-2 number, since 2×18949724964² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 814477 + ... + 837419.

Almost surely, 2^18949724964 is an apocalyptic number.

18949724964 is the 137658-th square number.

It is an amenable number.

18949724964 is an abundant number, since it is smaller than the sum of its proper divisors (28953056599).

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

18949724964 is an frugal number, since it uses more digits than its factorization.

18949724964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45896 (or 22948 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 63.

The spelling of 18949724964 in words is "eighteen billion, nine hundred forty-nine million, seven hundred twenty-four thousand, nine hundred sixty-four".