111206420257 has 2 divisors, whose sum is σ = 111206420258. Its totient is φ = 111206420256.

The previous prime is 111206420219. The next prime is 111206420309. The reversal of 111206420257 is 752024602111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105186056976 + 6020363281 = 324324^2 + 77591^2 .

It is an emirp because it is prime and its reverse (752024602111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111206420257 - 2²⁷ = 111072202529 is a prime.

It is not a weakly prime, because it can be changed into another prime (111206420207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55603210128 + 55603210129.

It is an arithmetic number, because the mean of its divisors is an integer number (55603210129).

Almost surely, 2^111206420257 is an apocalyptic number.

It is an amenable number.

111206420257 is a deficient number, since it is larger than the sum of its proper divisors (1).

111206420257 is an equidigital number, since it uses as much as digits as its factorization.

111206420257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 31.

The spelling of 111206420257 in words is "one hundred eleven billion, two hundred six million, four hundred twenty thousand, two hundred fifty-seven".