18975217872 has 80 divisors (see below), whose sum is σ = 54077663808. Its totient is φ = 5696117760.

The previous prime is 18975217871. The next prime is 18975217873. The reversal of 18975217872 is 27871257981.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18975217871) and next prime (18975217873).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18975217871) 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, 345258 + ... + 396425.

Almost surely, 2^18975217872 is an apocalyptic number.

18975217872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18975217872 is an abundant number, since it is smaller than the sum of its proper divisors (35102445936).

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

18975217872 is a wasteful number, since it uses less digits than its factorization.

18975217872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741748 (or 741742 counting only the distinct ones).

The product of its digits is 3951360, while the sum is 57.

The spelling of 18975217872 in words is "eighteen billion, nine hundred seventy-five million, two hundred seventeen thousand, eight hundred seventy-two".