18668420000 has 60 divisors (see below), whose sum is σ = 45927162666. Its totient is φ = 7467360000.

The previous prime is 18668419993. The next prime is 18668420021. The reversal of 18668420000 is 2486681.

It can be written as a sum of positive squares in 5 ways, for example, as 12138256 + 18656281744 = 3484^2 + 136588^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 446711 + ... + 486710.

Almost surely, 2^18668420000 is an apocalyptic number.

18668420000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18668420000 is an abundant number, since it is smaller than the sum of its proper divisors (27258742666).

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

18668420000 is an frugal number, since it uses more digits than its factorization.

18668420000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933451 (or 933428 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The spelling of 18668420000 in words is "eighteen billion, six hundred sixty-eight million, four hundred twenty thousand".