85517315705 has 4 divisors (see below), whose sum is σ = 102620778852. Its totient is φ = 68413852560.

The previous prime is 85517315677. The next prime is 85517315713. The reversal of 85517315705 is 50751371558.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32736388624 + 52780927081 = 180932^2 + 229741^2 .

It is not a de Polignac number, because 85517315705 - 2¹⁴ = 85517299321 is a prime.

It is a super-2 number, since 2×85517315705² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85517315705.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8551731566 + ... + 8551731575.

It is an arithmetic number, because the mean of its divisors is an integer number (25655194713).

Almost surely, 2^85517315705 is an apocalyptic number.

It is an amenable number.

85517315705 is a deficient number, since it is larger than the sum of its proper divisors (17103463147).

85517315705 is a wasteful number, since it uses less digits than its factorization.

85517315705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17103463146.

The product of its (nonzero) digits is 735000, while the sum is 47.

The spelling of 85517315705 in words is "eighty-five billion, five hundred seventeen million, three hundred fifteen thousand, seven hundred five".