68765665 has 4 divisors (see below), whose sum is σ = 82518804. Its totient is φ = 55012528.

The previous prime is 68765659. The next prime is 68765677. The reversal of 68765665 is 56656786.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56656786 = 2 ⋅28328393.

It can be written as a sum of positive squares in 2 ways, for example, as 30338064 + 38427601 = 5508^2 + 6199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68765665 is a prime.

It is a Duffinian number.

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, 6876562 + ... + 6876571.

It is an arithmetic number, because the mean of its divisors is an integer number (20629701).

Almost surely, 2^68765665 is an apocalyptic number.

It is an amenable number.

68765665 is a deficient number, since it is larger than the sum of its proper divisors (13753139).

68765665 is a wasteful number, since it uses less digits than its factorization.

68765665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13753138.

The product of its digits is 1814400, while the sum is 49.

The square root of 68765665 is about 8292.5065571273. The cubic root of 68765665 is about 409.6917472834.

The spelling of 68765665 in words is "sixty-eight million, seven hundred sixty-five thousand, six hundred sixty-five".