122556661309 has 2 divisors, whose sum is σ = 122556661310. Its totient is φ = 122556661308.

The previous prime is 122556661303. The next prime is 122556661319. The reversal of 122556661309 is 903166655221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81518815225 + 41037846084 = 285515^2 + 202578^2 .

It is a cyclic number.

It is not a de Polignac number, because 122556661309 - 2¹¹ = 122556659261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122556661303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61278330654 + 61278330655.

It is an arithmetic number, because the mean of its divisors is an integer number (61278330655).

Almost surely, 2^122556661309 is an apocalyptic number.

It is an amenable number.

122556661309 is a deficient number, since it is larger than the sum of its proper divisors (1).

122556661309 is an equidigital number, since it uses as much as digits as its factorization.

122556661309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 583200, while the sum is 46.

The spelling of 122556661309 in words is "one hundred twenty-two billion, five hundred fifty-six million, six hundred sixty-one thousand, three hundred nine".