11817418979 has 2 divisors, whose sum is σ = 11817418980. Its totient is φ = 11817418978.

The previous prime is 11817418939. The next prime is 11817418997. The reversal of 11817418979 is 97981471811.

Together with next prime (11817418997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11817418979 is a prime.

It is not a weakly prime, because it can be changed into another prime (11817418909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5908709489 + 5908709490.

It is an arithmetic number, because the mean of its divisors is an integer number (5908709490).

Almost surely, 2^11817418979 is an apocalyptic number.

11817418979 is a deficient number, since it is larger than the sum of its proper divisors (1).

11817418979 is an equidigital number, since it uses as much as digits as its factorization.

11817418979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 56.

The spelling of 11817418979 in words is "eleven billion, eight hundred seventeen million, four hundred eighteen thousand, nine hundred seventy-nine".