18415306979 has 4 divisors (see below), whose sum is σ = 18843569976. Its totient is φ = 17987043984.

The previous prime is 18415306951. The next prime is 18415306999. The reversal of 18415306979 is 97960351481.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18415306979 - 2¹² = 18415302883 is a prime.

It is a super-2 number, since 2×18415306979² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18415306979.

It is not an unprimeable number, because it can be changed into a prime (18415306919) 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, 214131434 + ... + 214131519.

It is an arithmetic number, because the mean of its divisors is an integer number (4710892494).

Almost surely, 2^18415306979 is an apocalyptic number.

18415306979 is a deficient number, since it is larger than the sum of its proper divisors (428262997).

18415306979 is an equidigital number, since it uses as much as digits as its factorization.

18415306979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428262996.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The spelling of 18415306979 in words is "eighteen billion, four hundred fifteen million, three hundred six thousand, nine hundred seventy-nine".