18694593808 has 20 divisors (see below), whose sum is σ = 39513573648. Its totient is φ = 8497542560.

The previous prime is 18694593751. The next prime is 18694593809. The reversal of 18694593808 is 80839549681.

It is a super-2 number, since 2×18694593808² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18694593809) 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, 53109466 + ... + 53109817.

Almost surely, 2^18694593808 is an apocalyptic number.

It is an amenable number.

18694593808 is an abundant number, since it is smaller than the sum of its proper divisors (20818979840).

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

18694593808 is a wasteful number, since it uses less digits than its factorization.

18694593808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106219302 (or 106219296 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 61.

The spelling of 18694593808 in words is "eighteen billion, six hundred ninety-four million, five hundred ninety-three thousand, eight hundred eight".