664624507 has 2 divisors, whose sum is σ = 664624508. Its totient is φ = 664624506.

The previous prime is 664624501. The next prime is 664624549. The reversal of 664624507 is 705426466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664624507 - 2¹¹ = 664622459 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664624507.

It is not a weakly prime, because it can be changed into another prime (664624501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332312253 + 332312254.

It is an arithmetic number, because the mean of its divisors is an integer number (332312254).

Almost surely, 2^664624507 is an apocalyptic number.

664624507 is a deficient number, since it is larger than the sum of its proper divisors (1).

664624507 is an equidigital number, since it uses as much as digits as its factorization.

664624507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 40.

The square root of 664624507 is about 25780.3123914354. The cubic root of 664624507 is about 872.6875569893.

The spelling of 664624507 in words is "six hundred sixty-four million, six hundred twenty-four thousand, five hundred seven".