18861522718 has 32 divisors (see below), whose sum is σ = 30436208640. Its totient is φ = 8738215200.

The previous prime is 18861522707. The next prime is 18861522767. The reversal of 18861522718 is 81722516881.

It is a happy number.

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, 3481780 + ... + 3487192.

It is an arithmetic number, because the mean of its divisors is an integer number (951131520).

Almost surely, 2^18861522718 is an apocalyptic number.

18861522718 is a deficient number, since it is larger than the sum of its proper divisors (11574685922).

18861522718 is a wasteful number, since it uses less digits than its factorization.

18861522718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7432.

The product of its digits is 430080, while the sum is 49.

The spelling of 18861522718 in words is "eighteen billion, eight hundred sixty-one million, five hundred twenty-two thousand, seven hundred eighteen".