12531817018 has 16 divisors (see below), whose sum is σ = 21531620160. Its totient is φ = 5358652416.

The previous prime is 12531816959. The next prime is 12531817021. The reversal of 12531817018 is 81071813521.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1004103 + ... + 1016506.

It is an arithmetic number, because the mean of its divisors is an integer number (1345726260).

Almost surely, 2^12531817018 is an apocalyptic number.

12531817018 is a deficient number, since it is larger than the sum of its proper divisors (8999803142).

12531817018 is a wasteful number, since it uses less digits than its factorization.

12531817018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2021061.

The product of its (nonzero) digits is 13440, while the sum is 37.

The spelling of 12531817018 in words is "twelve billion, five hundred thirty-one million, eight hundred seventeen thousand, eighteen".