664377457 has 2 divisors, whose sum is σ = 664377458. Its totient is φ = 664377456.

The previous prime is 664377451. The next prime is 664377479. The reversal of 664377457 is 754773466.

664377457 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., 604717281 + 59660176 = 24591^2 + 7724^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664377457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664377457.

It is not a weakly prime, because it can be changed into another prime (664377451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332188728 + 332188729.

It is an arithmetic number, because the mean of its divisors is an integer number (332188729).

Almost surely, 2^664377457 is an apocalyptic number.

It is an amenable number.

664377457 is a deficient number, since it is larger than the sum of its proper divisors (1).

664377457 is an equidigital number, since it uses as much as digits as its factorization.

664377457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2963520, while the sum is 49.

The square root of 664377457 is about 25775.5204991092. The cubic root of 664377457 is about 872.5794136303.

It can be divided in two parts, 6643 and 77457, that added together give a square (84100 = 290²).

The spelling of 664377457 in words is "six hundred sixty-four million, three hundred seventy-seven thousand, four hundred fifty-seven".