18378577657 has 8 divisors (see below), whose sum is σ = 20050853760. Its totient is φ = 16706550960.

The previous prime is 18378577627. The next prime is 18378577673. The reversal of 18378577657 is 75677587381.

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

It is a de Polignac number, because none of the positive numbers 2^k-18378577657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18378577627) 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, 113248 + ... + 222670.

It is an arithmetic number, because the mean of its divisors is an integer number (2506356720).

Almost surely, 2^18378577657 is an apocalyptic number.

It is an amenable number.

18378577657 is a deficient number, since it is larger than the sum of its proper divisors (1672276103).

18378577657 is a wasteful number, since it uses less digits than its factorization.

18378577657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124703.

The product of its digits is 69148800, while the sum is 64.

The spelling of 18378577657 in words is "eighteen billion, three hundred seventy-eight million, five hundred seventy-seven thousand, six hundred fifty-seven".