664622529 has 4 divisors (see below), whose sum is σ = 886163376. Its totient is φ = 443081684.

The previous prime is 664622503. The next prime is 664622537. The reversal of 664622529 is 925226466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 664622529 - 2⁷ = 664622401 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (664622129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110770419 + ... + 110770424.

It is an arithmetic number, because the mean of its divisors is an integer number (221540844).

Almost surely, 2^664622529 is an apocalyptic number.

It is an amenable number.

664622529 is a deficient number, since it is larger than the sum of its proper divisors (221540847).

664622529 is a wasteful number, since it uses less digits than its factorization.

664622529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221540846.

The product of its digits is 311040, while the sum is 42.

The square root of 664622529 is about 25780.2740287996. The cubic root of 664622529 is about 872.6866912485.

The spelling of 664622529 in words is "six hundred sixty-four million, six hundred twenty-two thousand, five hundred twenty-nine".