18979977824 has 24 divisors (see below), whose sum is σ = 37488566808. Its totient is φ = 9459072000.

The previous prime is 18979977823. The next prime is 18979977851. The reversal of 18979977824 is 42877997981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18979977823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 956177 + ... + 975824.

It is an arithmetic number, because the mean of its divisors is an integer number (1562023617).

Almost surely, 2^18979977824 is an apocalyptic number.

It is an amenable number.

18979977824 is a deficient number, since it is larger than the sum of its proper divisors (18508588984).

18979977824 is a wasteful number, since it uses less digits than its factorization.

18979977824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1932318 (or 1932310 counting only the distinct ones).

The product of its digits is 128024064, while the sum is 71.

The spelling of 18979977824 in words is "eighteen billion, nine hundred seventy-nine million, nine hundred seventy-seven thousand, eight hundred twenty-four".