18997608672 has 96 divisors (see below), whose sum is σ = 63325382400. Its totient is φ = 5427886464.

The previous prime is 18997608631. The next prime is 18997608677. The reversal of 18997608672 is 27680679981.

18997608672 is a `hidden beast` number, since 18 + 9 + 9 + 7 + 608 + 6 + 7 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18997608677) 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, 1564522 + ... + 1576617.

It is an arithmetic number, because the mean of its divisors is an integer number (659639400).

Almost surely, 2^18997608672 is an apocalyptic number.

18997608672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18997608672 is an abundant number, since it is smaller than the sum of its proper divisors (44327773728).

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

18997608672 is a wasteful number, since it uses less digits than its factorization.

18997608672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3141165 (or 3141151 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 63.

The spelling of 18997608672 in words is "eighteen billion, nine hundred ninety-seven million, six hundred eight thousand, six hundred seventy-two".