18981099687 has 16 divisors (see below), whose sum is σ = 27919088640. Its totient is φ = 11374440000.

The previous prime is 18981099673. The next prime is 18981099713. The reversal of 18981099687 is 78699018981.

It is not a de Polignac number, because 18981099687 - 2¹⁰ = 18981098663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18981099637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3228439 + ... + 3234312.

It is an arithmetic number, because the mean of its divisors is an integer number (1744943040).

Almost surely, 2^18981099687 is an apocalyptic number.

18981099687 is a deficient number, since it is larger than the sum of its proper divisors (8937988953).

18981099687 is a wasteful number, since it uses less digits than its factorization.

18981099687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6462854.

The product of its (nonzero) digits is 15676416, while the sum is 66.

The spelling of 18981099687 in words is "eighteen billion, nine hundred eighty-one million, ninety-nine thousand, six hundred eighty-seven".