18403374554 has 8 divisors (see below), whose sum is σ = 28278356148. Its totient is φ = 8977255840.

The previous prime is 18403374551. The next prime is 18403374571. The reversal of 18403374554 is 45547330481.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18323683225 + 79691329 = 135365^2 + 8927^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (18403374551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112215617 + ... + 112215780.

Almost surely, 2^18403374554 is an apocalyptic number.

18403374554 is a deficient number, since it is larger than the sum of its proper divisors (9874981594).

18403374554 is a wasteful number, since it uses less digits than its factorization.

18403374554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224431440.

The product of its (nonzero) digits is 806400, while the sum is 44.

The spelling of 18403374554 in words is "eighteen billion, four hundred three million, three hundred seventy-four thousand, five hundred fifty-four".