18997854437304 has 24 divisors (see below), whose sum is σ = 51452522434560. Its totient is φ = 6332618145744.

The previous prime is 18997854437299. The next prime is 18997854437333. The reversal of 18997854437304 is 40373445879981.

18997854437304 is a `hidden beast` number, since 1 + 8 + 9 + 9 + 7 + 8 + 544 + 3 + 73 + 0 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (72), and also a Moran number because the ratio is a prime number: 263859089407 = 18997854437304 / (1 + 8 + 9 + 9 + 7 + 8 + 5 + 4 + 4 + 3 + 7 + 3 + 0 + 4).

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, 131929544632 + ... + 131929544775.

It is an arithmetic number, because the mean of its divisors is an integer number (2143855101440).

Almost surely, 2^{18997854437304} is an apocalyptic number.

It is an amenable number.

18997854437304 is an abundant number, since it is smaller than the sum of its proper divisors (32454667997256).

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

18997854437304 is a wasteful number, since it uses less digits than its factorization.

18997854437304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263859089419 (or 263859089412 counting only the distinct ones).

The product of its (nonzero) digits is 731566080, while the sum is 72.

The spelling of 18997854437304 in words is "eighteen trillion, nine hundred ninety-seven billion, eight hundred fifty-four million, four hundred thirty-seven thousand, three hundred four".