18712561086 has 32 divisors (see below), whose sum is σ = 41589396480. Its totient is φ = 6236631288.

The previous prime is 18712561057. The next prime is 18712561121. The reversal of 18712561086 is 68016521781.

18712561086 is a `hidden beast` number, since 1 + 8 + 7 + 1 + 2 + 561 + 0 + 86 = 666.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 436755 + ... + 477681.

It is an arithmetic number, because the mean of its divisors is an integer number (1299668640).

Almost surely, 2^18712561086 is an apocalyptic number.

18712561086 is an abundant number, since it is smaller than the sum of its proper divisors (22876835394).

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

18712561086 is a wasteful number, since it uses less digits than its factorization.

18712561086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49405 (or 49399 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 18712561086 in words is "eighteen billion, seven hundred twelve million, five hundred sixty-one thousand, eighty-six".