111812659457 has 2 divisors, whose sum is σ = 111812659458. Its totient is φ = 111812659456.

The previous prime is 111812659397. The next prime is 111812659477. The reversal of 111812659457 is 754956218111.

It is a Cunningham number, because it is equal to 334384²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111812659456 + 1 = 334384^2 + 1^2 .

It is an emirp because it is prime and its reverse (754956218111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111812659457 - 2²⁶ = 111745550593 is a prime.

It is not a weakly prime, because it can be changed into another prime (111812659477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55906329728 + 55906329729.

It is an arithmetic number, because the mean of its divisors is an integer number (55906329729).

Almost surely, 2^111812659457 is an apocalyptic number.

It is an amenable number.

111812659457 is a deficient number, since it is larger than the sum of its proper divisors (1).

111812659457 is an equidigital number, since it uses as much as digits as its factorization.

111812659457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 604800, while the sum is 50.

The spelling of 111812659457 in words is "one hundred eleven billion, eight hundred twelve million, six hundred fifty-nine thousand, four hundred fifty-seven".