18964181840 has 80 divisors (see below), whose sum is σ = 44350470912. Its totient is φ = 7541309952.

The previous prime is 18964181839. The next prime is 18964181867. The reversal of 18964181840 is 4818146981.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11655107 + ... + 11656733.

Almost surely, 2^18964181840 is an apocalyptic number.

18964181840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18964181840 is an abundant number, since it is smaller than the sum of its proper divisors (25386289072).

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

18964181840 is a wasteful number, since it uses less digits than its factorization.

18964181840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2404 (or 2398 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 50.

The spelling of 18964181840 in words is "eighteen billion, nine hundred sixty-four million, one hundred eighty-one thousand, eight hundred forty".