111998194577 has 2 divisors, whose sum is σ = 111998194578. Its totient is φ = 111998194576.

The previous prime is 111998194543. The next prime is 111998194579. The reversal of 111998194577 is 775491899111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71355231376 + 40642963201 = 267124^2 + 201601^2 .

It is a cyclic number.

It is not a de Polignac number, because 111998194577 - 2²⁶ = 111931085713 is a prime.

Together with 111998194579, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111998194579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55999097288 + 55999097289.

It is an arithmetic number, because the mean of its divisors is an integer number (55999097289).

Almost surely, 2^111998194577 is an apocalyptic number.

It is an amenable number.

111998194577 is a deficient number, since it is larger than the sum of its proper divisors (1).

111998194577 is an equidigital number, since it uses as much as digits as its factorization.

111998194577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5715360, while the sum is 62.

The spelling of 111998194577 in words is "one hundred eleven billion, nine hundred ninety-eight million, one hundred ninety-four thousand, five hundred seventy-seven".