18604641972 has 48 divisors (see below), whose sum is σ = 49656575360. Its totient is φ = 5310876672.

The previous prime is 18604641953. The next prime is 18604641997. The reversal of 18604641972 is 27914640681.

It is a super-2 number, since 2×18604641972² (a number of 21 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 3253 + ... + 192924.

Almost surely, 2^18604641972 is an apocalyptic number.

18604641972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18604641972 is an abundant number, since it is smaller than the sum of its proper divisors (31051933388).

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

18604641972 is a wasteful number, since it uses less digits than its factorization.

18604641972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197320 (or 197318 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 48.

The spelling of 18604641972 in words is "eighteen billion, six hundred four million, six hundred forty-one thousand, nine hundred seventy-two".