18461646388 has 12 divisors (see below), whose sum is σ = 32333071680. Its totient is φ = 9223625912.

The previous prime is 18461646367. The next prime is 18461646421. The reversal of 18461646388 is 88364616481.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1793548 + ... + 1803811.

It is an arithmetic number, because the mean of its divisors is an integer number (2694422640).

Almost surely, 2^18461646388 is an apocalyptic number.

It is an amenable number.

18461646388 is a deficient number, since it is larger than the sum of its proper divisors (13871425292).

18461646388 is a wasteful number, since it uses less digits than its factorization.

18461646388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3598646 (or 3598644 counting only the distinct ones).

The product of its digits is 5308416, while the sum is 55.

The spelling of 18461646388 in words is "eighteen billion, four hundred sixty-one million, six hundred forty-six thousand, three hundred eighty-eight".