660034691 has 2 divisors, whose sum is σ = 660034692. Its totient is φ = 660034690.

The previous prime is 660034679. The next prime is 660034699. The reversal of 660034691 is 196430066.

660034691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660034691 is a prime.

It is not a weakly prime, because it can be changed into another prime (660034699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330017345 + 330017346.

It is an arithmetic number, because the mean of its divisors is an integer number (330017346).

Almost surely, 2^660034691 is an apocalyptic number.

660034691 is a deficient number, since it is larger than the sum of its proper divisors (1).

660034691 is an equidigital number, since it uses as much as digits as its factorization.

660034691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 660034691 is about 25691.1403211302. The cubic root of 660034691 is about 870.6740234074.

The spelling of 660034691 in words is "six hundred sixty million, thirty-four thousand, six hundred ninety-one".