85368081517 has 2 divisors, whose sum is σ = 85368081518. Its totient is φ = 85368081516.

The previous prime is 85368081509. The next prime is 85368081553. The reversal of 85368081517 is 71518086358.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45930490596 + 39437590921 = 214314^2 + 198589^2 .

It is a cyclic number.

It is not a de Polignac number, because 85368081517 - 2³ = 85368081509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85368084517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42684040758 + 42684040759.

It is an arithmetic number, because the mean of its divisors is an integer number (42684040759).

Almost surely, 2^85368081517 is an apocalyptic number.

It is an amenable number.

85368081517 is a deficient number, since it is larger than the sum of its proper divisors (1).

85368081517 is an equidigital number, since it uses as much as digits as its factorization.

85368081517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1612800, while the sum is 52.

The spelling of 85368081517 in words is "eighty-five billion, three hundred sixty-eight million, eighty-one thousand, five hundred seventeen".