18779989623 has 16 divisors (see below), whose sum is σ = 25181054976. Its totient is φ = 12449511360.

The previous prime is 18779989589. The next prime is 18779989649. The reversal of 18779989623 is 32698997781.

It is not a de Polignac number, because 18779989623 - 2⁶ = 18779989559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18779989673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1962336 + ... + 1971882.

It is an arithmetic number, because the mean of its divisors is an integer number (1573815936).

Almost surely, 2^18779989623 is an apocalyptic number.

18779989623 is a deficient number, since it is larger than the sum of its proper divisors (6401065353).

18779989623 is a wasteful number, since it uses less digits than its factorization.

18779989623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13174.

The product of its digits is 82301184, while the sum is 69.

The spelling of 18779989623 in words is "eighteen billion, seven hundred seventy-nine million, nine hundred eighty-nine thousand, six hundred twenty-three".