18647993375 has 16 divisors (see below), whose sum is σ = 25388397216. Its totient is φ = 13562176000.

The previous prime is 18647993369. The next prime is 18647993389. The reversal of 18647993375 is 57339974681.

It is not a de Polignac number, because 18647993375 - 2⁴ = 18647993359 is a prime.

It is a Duffinian number.

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, 6779714 + ... + 6782463.

It is an arithmetic number, because the mean of its divisors is an integer number (1586774826).

Almost surely, 2^18647993375 is an apocalyptic number.

18647993375 is a deficient number, since it is larger than the sum of its proper divisors (6740403841).

18647993375 is a wasteful number, since it uses less digits than its factorization.

18647993375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13562203 (or 13562193 counting only the distinct ones).

The product of its digits is 34292160, while the sum is 62.

The spelling of 18647993375 in words is "eighteen billion, six hundred forty-seven million, nine hundred ninety-three thousand, three hundred seventy-five".