111956261477 has 2 divisors, whose sum is σ = 111956261478. Its totient is φ = 111956261476.

The previous prime is 111956261449. The next prime is 111956261479. The reversal of 111956261477 is 774162659111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101216877316 + 10739384161 = 318146^2 + 103631^2 .

It is a cyclic number.

It is not a de Polignac number, because 111956261477 - 2³⁶ = 43236784741 is a prime.

Together with 111956261479, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111956261479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55978130738 + 55978130739.

It is an arithmetic number, because the mean of its divisors is an integer number (55978130739).

Almost surely, 2^111956261477 is an apocalyptic number.

It is an amenable number.

111956261477 is a deficient number, since it is larger than the sum of its proper divisors (1).

111956261477 is an equidigital number, since it uses as much as digits as its factorization.

111956261477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 50.

The spelling of 111956261477 in words is "one hundred eleven billion, nine hundred fifty-six million, two hundred sixty-one thousand, four hundred seventy-seven".