18726388648 has 16 divisors (see below), whose sum is σ = 38303976960. Its totient is φ = 8511994800.

The previous prime is 18726388613. The next prime is 18726388649. The reversal of 18726388648 is 84688362781.

It is not an unprimeable number, because it can be changed into a prime (18726388649) 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, 106399848 + ... + 106400023.

It is an arithmetic number, because the mean of its divisors is an integer number (2393998560).

Almost surely, 2^18726388648 is an apocalyptic number.

It is an amenable number.

18726388648 is an abundant number, since it is smaller than the sum of its proper divisors (19577588312).

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

18726388648 is a wasteful number, since it uses less digits than its factorization.

18726388648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212799888 (or 212799884 counting only the distinct ones).

The product of its digits is 24772608, while the sum is 61.

The spelling of 18726388648 in words is "eighteen billion, seven hundred twenty-six million, three hundred eighty-eight thousand, six hundred forty-eight".