18905553408 has 80 divisors (see below), whose sum is σ = 57560690880. Its totient is φ = 5401583616.

The previous prime is 18905553347. The next prime is 18905553421. The reversal of 18905553408 is 80435550981.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 868413 + ... + 889916.

It is an arithmetic number, because the mean of its divisors is an integer number (719508636).

Almost surely, 2^18905553408 is an apocalyptic number.

It is an amenable number.

18905553408 is an abundant number, since it is smaller than the sum of its proper divisors (38655137472).

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

18905553408 is an equidigital number, since it uses as much as digits as its factorization.

18905553408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758357 (or 1758341 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 48.

The spelling of 18905553408 in words is "eighteen billion, nine hundred five million, five hundred fifty-three thousand, four hundred eight".