18981099686 has 16 divisors (see below), whose sum is σ = 29162548800. Its totient is φ = 9262564968.

The previous prime is 18981099673. The next prime is 18981099713. The reversal of 18981099686 is 68699018981.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 562220 + ... + 595023.

It is an arithmetic number, because the mean of its divisors is an integer number (1822659300).

Almost surely, 2^18981099686 is an apocalyptic number.

18981099686 is a deficient number, since it is larger than the sum of its proper divisors (10181449114).

18981099686 is a wasteful number, since it uses less digits than its factorization.

18981099686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157443.

The product of its (nonzero) digits is 13436928, while the sum is 65.

The spelling of 18981099686 in words is "eighteen billion, nine hundred eighty-one million, ninety-nine thousand, six hundred eighty-six".