18666207648 has 120 divisors (see below), whose sum is σ = 59887507680. Its totient is φ = 5656417920.

The previous prime is 18666207617. The next prime is 18666207683. The reversal of 18666207648 is 84670266681.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 18666207594 and 18666207603.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 298828 + ... + 355851.

It is an arithmetic number, because the mean of its divisors is an integer number (499062564).

Almost surely, 2^18666207648 is an apocalyptic number.

18666207648 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18666207648 is an abundant number, since it is smaller than the sum of its proper divisors (41221300032).

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

18666207648 is a wasteful number, since it uses less digits than its factorization.

18666207648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654712 (or 654695 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 54.

The spelling of 18666207648 in words is "eighteen billion, six hundred sixty-six million, two hundred seven thousand, six hundred forty-eight".