18978934979 has 8 divisors (see below), whose sum is σ = 19593310080. Its totient is φ = 18364694400.

The previous prime is 18978934937. The next prime is 18978934981. The reversal of 18978934979 is 97943987981.

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 18978934979 - 2²⁴ = 18962157763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18978934999) 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 7 ways as a sum of consecutive naturals, for example, 308507 + ... + 364875.

It is an arithmetic number, because the mean of its divisors is an integer number (2449163760).

Almost surely, 2^18978934979 is an apocalyptic number.

18978934979 is a deficient number, since it is larger than the sum of its proper divisors (614375101).

18978934979 is a wasteful number, since it uses less digits than its factorization.

18978934979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67261.

The product of its digits is 246903552, while the sum is 74.

The spelling of 18978934979 in words is "eighteen billion, nine hundred seventy-eight million, nine hundred thirty-four thousand, nine hundred seventy-nine".