68645791 has 2 divisors, whose sum is σ = 68645792. Its totient is φ = 68645790.

The previous prime is 68645783. The next prime is 68645807. The reversal of 68645791 is 19754686.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68645791 - 2³ = 68645783 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68645701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34322895 + 34322896.

It is an arithmetic number, because the mean of its divisors is an integer number (34322896).

Almost surely, 2^68645791 is an apocalyptic number.

68645791 is a deficient number, since it is larger than the sum of its proper divisors (1).

68645791 is an equidigital number, since it uses as much as digits as its factorization.

68645791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 46.

The square root of 68645791 is about 8285.2755536554. The cubic root of 68645791 is about 409.4535472380.

The spelling of 68645791 in words is "sixty-eight million, six hundred forty-five thousand, seven hundred ninety-one".