18679938553 has 4 divisors (see below), whose sum is σ = 19282517248. Its totient is φ = 18077359860.

The previous prime is 18679938503. The next prime is 18679938647. The reversal of 18679938553 is 35583997681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18679938553 - 2²⁵ = 18646384121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18679938503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 301289301 + ... + 301289362.

It is an arithmetic number, because the mean of its divisors is an integer number (4820629312).

Almost surely, 2^18679938553 is an apocalyptic number.

It is an amenable number.

18679938553 is a deficient number, since it is larger than the sum of its proper divisors (602578695).

18679938553 is an equidigital number, since it uses as much as digits as its factorization.

18679938553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602578694.

The product of its digits is 48988800, while the sum is 64.

The spelling of 18679938553 in words is "eighteen billion, six hundred seventy-nine million, nine hundred thirty-eight thousand, five hundred fifty-three".