664610645 has 16 divisors (see below), whose sum is σ = 837741312. Its totient is φ = 505190400.

The previous prime is 664610629. The next prime is 664610651. The reversal of 664610645 is 546016466.

It is not a de Polignac number, because 664610645 - 2⁴ = 664610629 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664610599 and 664610608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1772 + ... + 36501.

It is an arithmetic number, because the mean of its divisors is an integer number (52358832).

Almost surely, 2^664610645 is an apocalyptic number.

It is an amenable number.

664610645 is a deficient number, since it is larger than the sum of its proper divisors (173130667).

664610645 is a wasteful number, since it uses less digits than its factorization.

664610645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38452.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 664610645 is about 25780.0435414683. The cubic root of 664610645 is about 872.6814897644.

The spelling of 664610645 in words is "six hundred sixty-four million, six hundred ten thousand, six hundred forty-five".