18640948640 has 48 divisors (see below), whose sum is σ = 46357103520. Its totient is φ = 7063937280.

The previous prime is 18640948633. The next prime is 18640948673. The reversal of 18640948640 is 4684904681.

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, 3062906 + ... + 3068985.

It is an arithmetic number, because the mean of its divisors is an integer number (965772990).

Almost surely, 2^18640948640 is an apocalyptic number.

18640948640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18640948640 is an abundant number, since it is smaller than the sum of its proper divisors (27716154880).

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

18640948640 is a wasteful number, since it uses less digits than its factorization.

18640948640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6131925 (or 6131917 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 50.

The spelling of 18640948640 in words is "eighteen billion, six hundred forty million, nine hundred forty-eight thousand, six hundred forty".