111781129420799 has 2 divisors, whose sum is σ = 111781129420800. Its totient is φ = 111781129420798.

The previous prime is 111781129420721. The next prime is 111781129420801. The reversal of 111781129420799 is 997024921187111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111781129420799 - 2³² = 111776834453503 is a prime.

Together with 111781129420801, 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 (111781129422799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55890564710399 + 55890564710400.

It is an arithmetic number, because the mean of its divisors is an integer number (55890564710400).

Almost surely, 2^{111781129420799} is an apocalyptic number.

111781129420799 is a deficient number, since it is larger than the sum of its proper divisors (1).

111781129420799 is an equidigital number, since it uses as much as digits as its factorization.

111781129420799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4572288, while the sum is 62.

The spelling of 111781129420799 in words is "one hundred eleven trillion, seven hundred eighty-one billion, one hundred twenty-nine million, four hundred twenty thousand, seven hundred ninety-nine".