18743916779 has 4 divisors (see below), whose sum is σ = 21421619184. Its totient is φ = 16066214376.

The previous prime is 18743916761. The next prime is 18743916781. The reversal of 18743916779 is 97761934781.

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-18743916779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18743916479) 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, 1338851192 + ... + 1338851205.

It is an arithmetic number, because the mean of its divisors is an integer number (5355404796).

Almost surely, 2^18743916779 is an apocalyptic number.

18743916779 is a deficient number, since it is larger than the sum of its proper divisors (2677702405).

18743916779 is an equidigital number, since it uses as much as digits as its factorization.

18743916779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2677702404.

The product of its digits is 16003008, while the sum is 62.

The spelling of 18743916779 in words is "eighteen billion, seven hundred forty-three million, nine hundred sixteen thousand, seven hundred seventy-nine".