18625421772 has 48 divisors (see below), whose sum is σ = 48949632480. Its totient is φ = 6123423744.

The previous prime is 18625421753. The next prime is 18625421777. The reversal of 18625421772 is 27712452681.

18625421772 is a `hidden beast` number, since 1 + 8 + 625 + 4 + 2 + 17 + 7 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (18625421777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1173333 + ... + 1189100.

It is an arithmetic number, because the mean of its divisors is an integer number (1019784010).

Almost surely, 2^18625421772 is an apocalyptic number.

18625421772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18625421772 is an abundant number, since it is smaller than the sum of its proper divisors (30324210708).

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

18625421772 is a wasteful number, since it uses less digits than its factorization.

18625421772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2362519 (or 2362511 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The spelling of 18625421772 in words is "eighteen billion, six hundred twenty-five million, four hundred twenty-one thousand, seven hundred seventy-two".