18945579997 has 8 divisors (see below), whose sum is σ = 19442162880. Its totient is φ = 18450639840.

The previous prime is 18945579973. The next prime is 18945580013. The reversal of 18945579997 is 79997554981.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18945579997 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 (18945579097) 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, 387297 + ... + 433462.

It is an arithmetic number, because the mean of its divisors is an integer number (2430270360).

Almost surely, 2^18945579997 is an apocalyptic number.

It is an amenable number.

18945579997 is a deficient number, since it is larger than the sum of its proper divisors (496582883).

18945579997 is an equidigital number, since it uses as much as digits as its factorization.

18945579997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821363.

The product of its digits is 257191200, while the sum is 73.

The spelling of 18945579997 in words is "eighteen billion, nine hundred forty-five million, five hundred seventy-nine thousand, nine hundred ninety-seven".