68085207515 has 16 divisors (see below), whose sum is σ = 89047129248. Its totient is φ = 49672540416.

The previous prime is 68085207511. The next prime is 68085207569. The reversal of 68085207515 is 51570258086.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 68085207515 - 2² = 68085207511 is a prime.

It is a super-2 number, since 2×68085207515² (a number of 22 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 68085207515.

It is not an unprimeable number, because it can be changed into a prime (68085207511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6304634 + ... + 6315423.

It is an arithmetic number, because the mean of its divisors is an integer number (5565445578).

Almost surely, 2^68085207515 is an apocalyptic number.

68085207515 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

68085207515 is a deficient number, since it is larger than the sum of its proper divisors (20961921733).

68085207515 is a wasteful number, since it uses less digits than its factorization.

68085207515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12620158.

The product of its (nonzero) digits is 672000, while the sum is 47.

The spelling of 68085207515 in words is "sixty-eight billion, eighty-five million, two hundred seven thousand, five hundred fifteen".