18368985657 has 8 divisors (see below), whose sum is σ = 26718524640. Its totient is φ = 11132718560.

The previous prime is 18368985653. The next prime is 18368985683. The reversal of 18368985657 is 75658986381.

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 18368985657 - 2² = 18368985653 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18368985653) 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, 278317932 + ... + 278317997.

It is an arithmetic number, because the mean of its divisors is an integer number (3339815580).

Almost surely, 2^18368985657 is an apocalyptic number.

It is an amenable number.

18368985657 is a deficient number, since it is larger than the sum of its proper divisors (8349538983).

18368985657 is a wasteful number, since it uses less digits than its factorization.

18368985657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556635943.

The product of its digits is 87091200, while the sum is 66.

The spelling of 18368985657 in words is "eighteen billion, three hundred sixty-eight million, nine hundred eighty-five thousand, six hundred fifty-seven".