18816854838 has 32 divisors (see below), whose sum is σ = 40002561504. Its totient is φ = 5880348672.

The previous prime is 18816854789. The next prime is 18816854843. The reversal of 18816854838 is 83845861881.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 332695 + ... + 385122.

It is an arithmetic number, because the mean of its divisors is an integer number (1250080047).

Almost surely, 2^18816854838 is an apocalyptic number.

18816854838 is an abundant number, since it is smaller than the sum of its proper divisors (21185706666).

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

18816854838 is a wasteful number, since it uses less digits than its factorization.

18816854838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718096.

The product of its digits is 11796480, while the sum is 60.

The spelling of 18816854838 in words is "eighteen billion, eight hundred sixteen million, eight hundred fifty-four thousand, eight hundred thirty-eight".