664958947 has 2 divisors, whose sum is σ = 664958948. Its totient is φ = 664958946.

The previous prime is 664958929. The next prime is 664958963. The reversal of 664958947 is 749859466.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664958947 - 2¹¹ = 664956899 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664958891 and 664958900.

It is not a weakly prime, because it can be changed into another prime (664958977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332479473 + 332479474.

It is an arithmetic number, because the mean of its divisors is an integer number (332479474).

Almost surely, 2^664958947 is an apocalyptic number.

664958947 is a deficient number, since it is larger than the sum of its proper divisors (1).

664958947 is an equidigital number, since it uses as much as digits as its factorization.

664958947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13063680, while the sum is 58.

The square root of 664958947 is about 25786.7979206415. The cubic root of 664958947 is about 872.8339116513.

The spelling of 664958947 in words is "six hundred sixty-four million, nine hundred fifty-eight thousand, nine hundred forty-seven".