68660791 has 4 divisors (see below), whose sum is σ = 68733792. Its totient is φ = 68587792.

The previous prime is 68660783. The next prime is 68660797. The reversal of 68660791 is 19706686.

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

It is a cyclic number.

It is not a de Polignac number, because 68660791 - 2³ = 68660783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68660797) 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, 35071 + ... + 36976.

It is an arithmetic number, because the mean of its divisors is an integer number (17183448).

Almost surely, 2^68660791 is an apocalyptic number.

68660791 is a deficient number, since it is larger than the sum of its proper divisors (73001).

68660791 is an equidigital number, since it uses as much as digits as its factorization.

68660791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73000.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 68660791 is about 8286.1807245558. The cubic root of 68660791 is about 409.4833687115.

The spelling of 68660791 in words is "sixty-eight million, six hundred sixty thousand, seven hundred ninety-one".