18668683340 has 48 divisors (see below), whose sum is σ = 40234821984. Its totient is φ = 7271846400.

The previous prime is 18668683337. The next prime is 18668683367. The reversal of 18668683340 is 4338686681.

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, 427730 + ... + 469350.

It is an arithmetic number, because the mean of its divisors is an integer number (838225458).

Almost surely, 2^18668683340 is an apocalyptic number.

18668683340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18668683340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20117410992).

18668683340 is an abundant number, since it is smaller than the sum of its proper divisors (21566138644).

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

18668683340 is a wasteful number, since it uses less digits than its factorization.

18668683340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42218 (or 42216 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 53.

The spelling of 18668683340 in words is "eighteen billion, six hundred sixty-eight million, six hundred eighty-three thousand, three hundred forty".