18696690836 has 12 divisors (see below), whose sum is σ = 32724940500. Its totient is φ = 9346707840.

The previous prime is 18696690827. The next prime is 18696690839. The reversal of 18696690836 is 63809669681.

It can be written as a sum of positive squares in 2 ways, for example, as 5032483600 + 13664207236 = 70940^2 + 116894^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18696690839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383525 + ... + 429516.

It is an arithmetic number, because the mean of its divisors is an integer number (2727078375).

Almost surely, 2^18696690836 is an apocalyptic number.

It is an amenable number.

18696690836 is a deficient number, since it is larger than the sum of its proper divisors (14028249664).

18696690836 is a wasteful number, since it uses less digits than its factorization.

18696690836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818794 (or 818792 counting only the distinct ones).

The product of its (nonzero) digits is 20155392, while the sum is 62.

The spelling of 18696690836 in words is "eighteen billion, six hundred ninety-six million, six hundred ninety thousand, eight hundred thirty-six".