111518454621979 has 2 divisors, whose sum is σ = 111518454621980. Its totient is φ = 111518454621978.

The previous prime is 111518454621947. The next prime is 111518454621991. The reversal of 111518454621979 is 979126454815111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111518454621979 - 2⁵ = 111518454621947 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111518454621979.

It is not a weakly prime, because it can be changed into another prime (111518454621779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55759227310989 + 55759227310990.

It is an arithmetic number, because the mean of its divisors is an integer number (55759227310990).

Almost surely, 2^{111518454621979} is an apocalyptic number.

111518454621979 is a deficient number, since it is larger than the sum of its proper divisors (1).

111518454621979 is an equidigital number, since it uses as much as digits as its factorization.

111518454621979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21772800, while the sum is 64.

The spelling of 111518454621979 in words is "one hundred eleven trillion, five hundred eighteen billion, four hundred fifty-four million, six hundred twenty-one thousand, nine hundred seventy-nine".