18308197979 has 8 divisors (see below), whose sum is σ = 18438554112. Its totient is φ = 18178062120.

The previous prime is 18308197967. The next prime is 18308197993. The reversal of 18308197979 is 97979180381.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18308197979 is a prime.

It is a super-2 number, since 2×18308197979² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18308197879) 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, 113582 + ... + 222524.

It is an arithmetic number, because the mean of its divisors is an integer number (2304819264).

Almost surely, 2^18308197979 is an apocalyptic number.

18308197979 is a deficient number, since it is larger than the sum of its proper divisors (130356133).

18308197979 is a wasteful number, since it uses less digits than its factorization.

18308197979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110137.

The product of its (nonzero) digits is 6858432, while the sum is 62.

The spelling of 18308197979 in words is "eighteen billion, three hundred eight million, one hundred ninety-seven thousand, nine hundred seventy-nine".