18154553664 has 112 divisors (see below), whose sum is σ = 51827306048. Its totient is φ = 5575385088.

The previous prime is 18154553647. The next prime is 18154553699. The reversal of 18154553664 is 46635545181.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1358664 + ... + 1371960.

It is an arithmetic number, because the mean of its divisors is an integer number (462743804).

Almost surely, 2^18154553664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18154553664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25913653024).

18154553664 is an abundant number, since it is smaller than the sum of its proper divisors (33672752384).

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

18154553664 is a wasteful number, since it uses less digits than its factorization.

18154553664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13872 (or 13862 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 48.

The spelling of 18154553664 in words is "eighteen billion, one hundred fifty-four million, five hundred fifty-three thousand, six hundred sixty-four".