68515617 has 4 divisors (see below), whose sum is σ = 91354160. Its totient is φ = 45677076.

The previous prime is 68515609. The next prime is 68515619. The reversal of 68515617 is 71651586.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 68515617 - 2³ = 68515609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68515619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11419267 + ... + 11419272.

It is an arithmetic number, because the mean of its divisors is an integer number (22838540).

Almost surely, 2^68515617 is an apocalyptic number.

It is an amenable number.

68515617 is a deficient number, since it is larger than the sum of its proper divisors (22838543).

68515617 is a wasteful number, since it uses less digits than its factorization.

68515617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22838542.

The product of its digits is 50400, while the sum is 39.

The square root of 68515617 is about 8277.4160823291. The cubic root of 68515617 is about 409.1945659169.

The spelling of 68515617 in words is "sixty-eight million, five hundred fifteen thousand, six hundred seventeen".