18403065816 has 64 divisors (see below), whose sum is σ = 47119144800. Its totient is φ = 5987893248.

The previous prime is 18403065799. The next prime is 18403065817. The reversal of 18403065816 is 61856030481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18403065817) 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, 115800 + ... + 224088.

Almost surely, 2^18403065816 is an apocalyptic number.

It is an amenable number.

18403065816 is an abundant number, since it is smaller than the sum of its proper divisors (28716078984).

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

18403065816 is a wasteful number, since it uses less digits than its factorization.

18403065816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108468 (or 108464 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The spelling of 18403065816 in words is "eighteen billion, four hundred three million, sixty-five thousand, eight hundred sixteen".