18696945888 has 72 divisors (see below), whose sum is σ = 55002893400. Its totient is φ = 6017405184.

The previous prime is 18696945881. The next prime is 18696945889. The reversal of 18696945888 is 88854969681.

18696945888 is a `hidden beast` number, since 1 + 8 + 6 + 96 + 9 + 458 + 88 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18696945881) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1110958 + ... + 1127661.

It is an arithmetic number, because the mean of its divisors is an integer number (763929075).

Almost surely, 2^18696945888 is an apocalyptic number.

18696945888 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18696945888 is an abundant number, since it is smaller than the sum of its proper divisors (36305947512).

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

18696945888 is a wasteful number, since it uses less digits than its factorization.

18696945888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2238664 (or 2238653 counting only the distinct ones).

The product of its digits is 238878720, while the sum is 72.

The spelling of 18696945888 in words is "eighteen billion, six hundred ninety-six million, nine hundred forty-five thousand, eight hundred eighty-eight".