18478032297984 has 1792 divisors, whose sum is σ = 69954707496960. Its totient is φ = 4696320245760.

The previous prime is 18478032297983. The next prime is 18478032298009. The reversal of 18478032297984 is 48979223087481.

18478032297984 is a `hidden beast` number, since 1 + 8 + 478 + 0 + 3 + 2 + 2 + 9 + 79 + 84 = 666.

It is a tau number, because it is divible by the number of its divisors (1792).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (18478032297983) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 79304859532 + ... + 79304859764.

Almost surely, 2^{18478032297984} is an apocalyptic number.

18478032297984 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18478032297984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34977353748480).

18478032297984 is an abundant number, since it is smaller than the sum of its proper divisors (51476675198976).

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

18478032297984 is a wasteful number, since it uses less digits than its factorization.

18478032297984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446 (or 416 counting only the distinct ones).

The product of its (nonzero) digits is 390168576, while the sum is 72.

The spelling of 18478032297984 in words is "eighteen trillion, four hundred seventy-eight billion, thirty-two million, two hundred ninety-seven thousand, nine hundred eighty-four".