111878807809 has 2 divisors, whose sum is σ = 111878807810. Its totient is φ = 111878807808.

The previous prime is 111878807791. The next prime is 111878807813. The reversal of 111878807809 is 908708878111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107123326209 + 4755481600 = 327297^2 + 68960^2 .

It is a cyclic number.

It is not a de Polignac number, because 111878807809 - 2²⁷ = 111744590081 is a prime.

It is not a weakly prime, because it can be changed into another prime (111828807809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55939403904 + 55939403905.

It is an arithmetic number, because the mean of its divisors is an integer number (55939403905).

Almost surely, 2^111878807809 is an apocalyptic number.

It is an amenable number.

111878807809 is a deficient number, since it is larger than the sum of its proper divisors (1).

111878807809 is an equidigital number, since it uses as much as digits as its factorization.

111878807809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1806336, while the sum is 58.

The spelling of 111878807809 in words is "one hundred eleven billion, eight hundred seventy-eight million, eight hundred seven thousand, eight hundred nine".