18997854437376 has 96 divisors (see below), whose sum is σ = 54881854005420. Its totient is φ = 6332618047488.

The previous prime is 18997854437363. The next prime is 18997854437411. The reversal of 18997854437376 is 67373445879981.

18997854437376 is a `hidden beast` number, since 1 + 8 + 9 + 9 + 7 + 8 + 544 + 37 + 37 + 6 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 18997854437295 and 18997854437304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31914450 + ... + 32504273.

Almost surely, 2^{18997854437376} is an apocalyptic number.

18997854437376 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18997854437376 is an abundant number, since it is smaller than the sum of its proper divisors (35883999568044).

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

18997854437376 is an frugal number, since it uses more digits than its factorization.

18997854437376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64418759 (or 64418728 counting only the distinct ones).

The product of its digits is 7681443840, while the sum is 81.

The spelling of 18997854437376 in words is "eighteen trillion, nine hundred ninety-seven billion, eight hundred fifty-four million, four hundred thirty-seven thousand, three hundred seventy-six".