18698965840 has 40 divisors (see below), whose sum is σ = 43497216000. Its totient is φ = 7475780736.

The previous prime is 18698965819. The next prime is 18698965867. The reversal of 18698965840 is 4856989681.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101457 + ... + 218383.

It is an arithmetic number, because the mean of its divisors is an integer number (1087430400).

Almost surely, 2^18698965840 is an apocalyptic number.

18698965840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18698965840 is an abundant number, since it is smaller than the sum of its proper divisors (24798250160).

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

18698965840 is a wasteful number, since it uses less digits than its factorization.

18698965840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118939 (or 118933 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 64.

The spelling of 18698965840 in words is "eighteen billion, six hundred ninety-eight million, nine hundred sixty-five thousand, eight hundred forty".