245615556617 has 2 divisors, whose sum is σ = 245615556618. Its totient is φ = 245615556616.

The previous prime is 245615556581. The next prime is 245615556671. The reversal of 245615556617 is 716655516542.

Together with next prime (245615556671) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133485006736 + 112130549881 = 365356^2 + 334859^2 .

It is a cyclic number.

It is not a de Polignac number, because 245615556617 - 2⁶ = 245615556553 is a prime.

It is not a weakly prime, because it can be changed into another prime (245615556917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122807778308 + 122807778309.

It is an arithmetic number, because the mean of its divisors is an integer number (122807778309).

Almost surely, 2^245615556617 is an apocalyptic number.

It is an amenable number.

245615556617 is a deficient number, since it is larger than the sum of its proper divisors (1).

245615556617 is an equidigital number, since it uses as much as digits as its factorization.

245615556617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560000, while the sum is 53.

The spelling of 245615556617 in words is "two hundred forty-five billion, six hundred fifteen million, five hundred fifty-six thousand, six hundred seventeen".