245436641617 has 2 divisors, whose sum is σ = 245436641618. Its totient is φ = 245436641616.

The previous prime is 245436641609. The next prime is 245436641647. The reversal of 245436641617 is 716146634542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194848085056 + 50588556561 = 441416^2 + 224919^2 .

It is a cyclic number.

It is not a de Polignac number, because 245436641617 - 2³ = 245436641609 is a prime.

It is not a weakly prime, because it can be changed into another prime (245436641647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122718320808 + 122718320809.

It is an arithmetic number, because the mean of its divisors is an integer number (122718320809).

Almost surely, 2^245436641617 is an apocalyptic number.

It is an amenable number.

245436641617 is a deficient number, since it is larger than the sum of its proper divisors (1).

245436641617 is an equidigital number, since it uses as much as digits as its factorization.

245436641617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 49.

The spelling of 245436641617 in words is "two hundred forty-five billion, four hundred thirty-six million, six hundred forty-one thousand, six hundred seventeen".