18216516738 has 16 divisors (see below), whose sum is σ = 41637752640. Its totient is φ = 5204719056.

The previous prime is 18216516713. The next prime is 18216516743. The reversal of 18216516738 is 83761561281.

It is a Curzon number.

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, 216863253 + ... + 216863336.

It is an arithmetic number, because the mean of its divisors is an integer number (2602359540).

Almost surely, 2^18216516738 is an apocalyptic number.

18216516738 is an abundant number, since it is smaller than the sum of its proper divisors (23421235902).

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

18216516738 is a wasteful number, since it uses less digits than its factorization.

18216516738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433726601.

The product of its digits is 483840, while the sum is 48.

The spelling of 18216516738 in words is "eighteen billion, two hundred sixteen million, five hundred sixteen thousand, seven hundred thirty-eight".