18657938893 has 8 divisors (see below), whose sum is σ = 20429225856. Its totient is φ = 16899170400.

The previous prime is 18657938867. The next prime is 18657938917. The reversal of 18657938893 is 39883975681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18657938893 - 2¹⁷ = 18657807821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18657938293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3126496 + ... + 3132457.

It is an arithmetic number, because the mean of its divisors is an integer number (2553653232).

Almost surely, 2^18657938893 is an apocalyptic number.

It is an amenable number.

18657938893 is a deficient number, since it is larger than the sum of its proper divisors (1771286963).

18657938893 is a wasteful number, since it uses less digits than its factorization.

18657938893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6259235.

The product of its digits is 78382080, while the sum is 67.

The spelling of 18657938893 in words is "eighteen billion, six hundred fifty-seven million, nine hundred thirty-eight thousand, eight hundred ninety-three".