18979589983 has 4 divisors (see below), whose sum is σ = 19007792128. Its totient is φ = 18951387840.

The previous prime is 18979589957. The next prime is 18979590023. The reversal of 18979589983 is 38998597981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18979589983 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 (18979589933) 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, 14100063 + ... + 14101408.

It is an arithmetic number, because the mean of its divisors is an integer number (4751948032).

Almost surely, 2^18979589983 is an apocalyptic number.

18979589983 is a deficient number, since it is larger than the sum of its proper divisors (28202145).

18979589983 is an equidigital number, since it uses as much as digits as its factorization.

18979589983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28202144.

The product of its digits is 352719360, while the sum is 76.

The spelling of 18979589983 in words is "eighteen billion, nine hundred seventy-nine million, five hundred eighty-nine thousand, nine hundred eighty-three".