18645604572 has 24 divisors (see below), whose sum is σ = 49721612416. Its totient is φ = 5327315568.

The previous prime is 18645604547. The next prime is 18645604597. The reversal of 18645604572 is 27540654681.

It is an interprime number because it is at equal distance from previous prime (18645604547) and next prime (18645604597).

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 110985658 + ... + 110985825.

Almost surely, 2^18645604572 is an apocalyptic number.

18645604572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18645604572 is an abundant number, since it is smaller than the sum of its proper divisors (31076007844).

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

18645604572 is a wasteful number, since it uses less digits than its factorization.

18645604572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221971497 (or 221971495 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 48.

The spelling of 18645604572 in words is "eighteen billion, six hundred forty-five million, six hundred four thousand, five hundred seventy-two".