18665493728 has 48 divisors (see below), whose sum is σ = 42026997600. Its totient is φ = 7993852416.

The previous prime is 18665493719. The next prime is 18665493773. The reversal of 18665493728 is 82739456681.

It is a super-2 number, since 2×18665493728² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296798 + ... + 354146.

It is an arithmetic number, because the mean of its divisors is an integer number (875562450).

Almost surely, 2^18665493728 is an apocalyptic number.

It is an amenable number.

18665493728 is an abundant number, since it is smaller than the sum of its proper divisors (23361503872).

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

18665493728 is a wasteful number, since it uses less digits than its factorization.

18665493728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58819 (or 58811 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 59.

The spelling of 18665493728 in words is "eighteen billion, six hundred sixty-five million, four hundred ninety-three thousand, seven hundred twenty-eight".