664560451 has 2 divisors, whose sum is σ = 664560452. Its totient is φ = 664560450.

The previous prime is 664560427. The next prime is 664560461. The reversal of 664560451 is 154065466.

664560451 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 not a de Polignac number, because 664560451 - 2²³ = 656171843 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664560451.

It is not a weakly prime, because it can be changed into another prime (664560461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332280225 + 332280226.

It is an arithmetic number, because the mean of its divisors is an integer number (332280226).

Almost surely, 2^664560451 is an apocalyptic number.

664560451 is a deficient number, since it is larger than the sum of its proper divisors (1).

664560451 is an equidigital number, since it uses as much as digits as its factorization.

664560451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 664560451 is about 25779.0700181368. The cubic root of 664560451 is about 872.6595197695.

The spelling of 664560451 in words is "six hundred sixty-four million, five hundred sixty thousand, four hundred fifty-one".