18695690891 has 16 divisors (see below), whose sum is σ = 20346318720. Its totient is φ = 17107015680.

The previous prime is 18695690873. The next prime is 18695690933. The reversal of 18695690891 is 19809659681.

It is not a de Polignac number, because 18695690891 - 2¹⁰ = 18695689867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18695690861) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 845150 + ... + 866988.

It is an arithmetic number, because the mean of its divisors is an integer number (1271644920).

Almost surely, 2^18695690891 is an apocalyptic number.

18695690891 is a deficient number, since it is larger than the sum of its proper divisors (1650627829).

18695690891 is a wasteful number, since it uses less digits than its factorization.

18695690891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23254.

The product of its (nonzero) digits is 8398080, while the sum is 62.

The spelling of 18695690891 in words is "eighteen billion, six hundred ninety-five million, six hundred ninety thousand, eight hundred ninety-one".