68736665 has 4 divisors (see below), whose sum is σ = 82484004. Its totient is φ = 54989328.

The previous prime is 68736659. The next prime is 68736667. The reversal of 68736665 is 56663786.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56663786 = 2 ⋅28331893.

It can be written as a sum of positive squares in 2 ways, for example, as 50580544 + 18156121 = 7112^2 + 4261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68736665 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68736667) 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, 6873662 + ... + 6873671.

It is an arithmetic number, because the mean of its divisors is an integer number (20621001).

Almost surely, 2^68736665 is an apocalyptic number.

It is an amenable number.

68736665 is a deficient number, since it is larger than the sum of its proper divisors (13747339).

68736665 is a wasteful number, since it uses less digits than its factorization.

68736665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13747338.

The product of its digits is 1088640, while the sum is 47.

The square root of 68736665 is about 8290.7578061357. The cubic root of 68736665 is about 409.6341471655.

The spelling of 68736665 in words is "sixty-eight million, seven hundred thirty-six thousand, six hundred sixty-five".