121785559565023 has 2 divisors, whose sum is σ = 121785559565024. Its totient is φ = 121785559565022.

The previous prime is 121785559565009. The next prime is 121785559565039. The reversal of 121785559565023 is 320565955587121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121785559565023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121785559565063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60892779782511 + 60892779782512.

It is an arithmetic number, because the mean of its divisors is an integer number (60892779782512).

Almost surely, 2^{121785559565023} is an apocalyptic number.

121785559565023 is a deficient number, since it is larger than the sum of its proper divisors (1).

121785559565023 is an equidigital number, since it uses as much as digits as its factorization.

121785559565023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 113400000, while the sum is 64.

The spelling of 121785559565023 in words is "one hundred twenty-one trillion, seven hundred eighty-five billion, five hundred fifty-nine million, five hundred sixty-five thousand, twenty-three".