664030091 has 2 divisors, whose sum is σ = 664030092. Its totient is φ = 664030090.

The previous prime is 664030051. The next prime is 664030093. The reversal of 664030091 is 190030466.

664030091 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-664030091 is a prime.

Together with 664030093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (664030093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332015045 + 332015046.

It is an arithmetic number, because the mean of its divisors is an integer number (332015046).

Almost surely, 2^664030091 is an apocalyptic number.

664030091 is a deficient number, since it is larger than the sum of its proper divisors (1).

664030091 is an equidigital number, since it uses as much as digits as its factorization.

664030091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 664030091 is about 25768.7813254721. The cubic root of 664030091 is about 872.4273127132.

The spelling of 664030091 in words is "six hundred sixty-four million, thirty thousand, ninety-one".