664630451 has 2 divisors, whose sum is σ = 664630452. Its totient is φ = 664630450.

The previous prime is 664630411. The next prime is 664630493. The reversal of 664630451 is 154036466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664630451 - 2⁶ = 664630387 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (664630411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332315225 + 332315226.

It is an arithmetic number, because the mean of its divisors is an integer number (332315226).

Almost surely, 2^664630451 is an apocalyptic number.

664630451 is a deficient number, since it is larger than the sum of its proper divisors (1).

664630451 is an equidigital number, since it uses as much as digits as its factorization.

664630451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 664630451 is about 25780.4276729460. The cubic root of 664630451 is about 872.6901585783.

The spelling of 664630451 in words is "six hundred sixty-four million, six hundred thirty thousand, four hundred fifty-one".