18709911979 has 8 divisors (see below), whose sum is σ = 20415209472. Its totient is φ = 17005347240.

The previous prime is 18709911923. The next prime is 18709912007. The reversal of 18709911979 is 97911990781.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18709911979 - 2¹¹ = 18709909931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18709911919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129099 + ... + 232564.

It is an arithmetic number, because the mean of its divisors is an integer number (2551901184).

Almost surely, 2^18709911979 is an apocalyptic number.

18709911979 is a deficient number, since it is larger than the sum of its proper divisors (1705297493).

18709911979 is a wasteful number, since it uses less digits than its factorization.

18709911979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366377.

The product of its (nonzero) digits is 2571912, while the sum is 61.

The spelling of 18709911979 in words is "eighteen billion, seven hundred nine million, nine hundred eleven thousand, nine hundred seventy-nine".