18621442648 has 64 divisors (see below), whose sum is σ = 37628388000. Its totient is φ = 8621491200.

The previous prime is 18621442639. The next prime is 18621442661. The reversal of 18621442648 is 84624412681.

It is a junction number, because it is equal to n+sod(n) for n = 18621442598 and 18621442607.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 544618 + ... + 577798.

Almost surely, 2^18621442648 is an apocalyptic number.

It is an amenable number.

18621442648 is an abundant number, since it is smaller than the sum of its proper divisors (19006945352).

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

18621442648 is a wasteful number, since it uses less digits than its factorization.

18621442648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33316 (or 33312 counting only the distinct ones).

The product of its digits is 589824, while the sum is 46.

The spelling of 18621442648 in words is "eighteen billion, six hundred twenty-one million, four hundred forty-two thousand, six hundred forty-eight".