5518533921 has 16 divisors (see below), whose sum is σ = 7446878208. Its totient is φ = 3634848000.

The previous prime is 5518533919. The next prime is 5518533953. The reversal of 5518533921 is 1293358155.

It is not a de Polignac number, because 5518533921 - 2¹ = 5518533919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5518533961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61771 + ... + 121871.

It is an arithmetic number, because the mean of its divisors is an integer number (465429888).

Almost surely, 2^5518533921 is an apocalyptic number.

It is an amenable number.

5518533921 is a deficient number, since it is larger than the sum of its proper divisors (1928344287).

5518533921 is a wasteful number, since it uses less digits than its factorization.

5518533921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60472.

The product of its digits is 162000, while the sum is 42.

The square root of 5518533921 is about 74286.8354488196. The cubic root of 5518533921 is about 1767.1547081985.

The spelling of 5518533921 in words is "five billion, five hundred eighteen million, five hundred thirty-three thousand, nine hundred twenty-one".