18419638864 has 20 divisors (see below), whose sum is σ = 38932418880. Its totient is φ = 8372563040.

The previous prime is 18419638759. The next prime is 18419638883. The reversal of 18419638864 is 46883691481.

It is a junction number, because it is equal to n+sod(n) for n = 18419638799 and 18419638808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52328344 + ... + 52328695.

It is an arithmetic number, because the mean of its divisors is an integer number (1946620944).

Almost surely, 2^18419638864 is an apocalyptic number.

It is an amenable number.

18419638864 is an abundant number, since it is smaller than the sum of its proper divisors (20512780016).

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

18419638864 is a wasteful number, since it uses less digits than its factorization.

18419638864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104657058 (or 104657052 counting only the distinct ones).

The product of its digits is 7962624, while the sum is 58.

The spelling of 18419638864 in words is "eighteen billion, four hundred nineteen million, six hundred thirty-eight thousand, eight hundred sixty-four".