18938542660 has 12 divisors (see below), whose sum is σ = 39770939628. Its totient is φ = 7575417056.

The previous prime is 18938542633. The next prime is 18938542663. The reversal of 18938542660 is 6624583981.

It can be written as a sum of positive squares in 2 ways, for example, as 13036615684 + 5901926976 = 114178^2 + 76824^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18938542598 and 18938542607.

It is not an unprimeable number, because it can be changed into a prime (18938542663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 473463547 + ... + 473463586.

It is an arithmetic number, because the mean of its divisors is an integer number (3314244969).

Almost surely, 2^18938542660 is an apocalyptic number.

18938542660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18938542660 is an abundant number, since it is smaller than the sum of its proper divisors (20832396968).

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

18938542660 is a wasteful number, since it uses less digits than its factorization.

18938542660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946927142 (or 946927140 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 52.

The spelling of 18938542660 in words is "eighteen billion, nine hundred thirty-eight million, five hundred forty-two thousand, six hundred sixty".