18973329777 has 24 divisors (see below), whose sum is σ = 27527081088. Its totient is φ = 12593037600.

The previous prime is 18973329769. The next prime is 18973329797. The reversal of 18973329777 is 77792337981.

It is not a de Polignac number, because 18973329777 - 2³ = 18973329769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18973329797) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5708038 + ... + 5711360.

It is an arithmetic number, because the mean of its divisors is an integer number (1146961712).

Almost surely, 2^18973329777 is an apocalyptic number.

It is an amenable number.

18973329777 is a deficient number, since it is larger than the sum of its proper divisors (8553751311).

18973329777 is a wasteful number, since it uses less digits than its factorization.

18973329777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5941 (or 5938 counting only the distinct ones).

The product of its digits is 28005264, while the sum is 63.

The spelling of 18973329777 in words is "eighteen billion, nine hundred seventy-three million, three hundred twenty-nine thousand, seven hundred seventy-seven".