664035961 has 2 divisors, whose sum is σ = 664035962. Its totient is φ = 664035960.

The previous prime is 664035947. The next prime is 664035979. The reversal of 664035961 is 169530466.

664035961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 403407225 + 260628736 = 20085^2 + 16144^2 .

It is a cyclic number.

It is not a de Polignac number, because 664035961 - 2⁷ = 664035833 is a prime.

It is not a weakly prime, because it can be changed into another prime (664035941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332017980 + 332017981.

It is an arithmetic number, because the mean of its divisors is an integer number (332017981).

Almost surely, 2^664035961 is an apocalyptic number.

It is an amenable number.

664035961 is a deficient number, since it is larger than the sum of its proper divisors (1).

664035961 is an equidigital number, since it uses as much as digits as its factorization.

664035961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 664035961 is about 25768.8952227293. The cubic root of 664035961 is about 872.4298834468.

The spelling of 664035961 in words is "six hundred sixty-four million, thirty-five thousand, nine hundred sixty-one".