664424445 has 16 divisors (see below), whose sum is σ = 1064184192. Its totient is φ = 353991360.

The previous prime is 664424407. The next prime is 664424473. The reversal of 664424445 is 544424466.

It is not a de Polignac number, because 664424445 - 2⁷ = 664424317 is a prime.

It is a super-2 number, since 2×664424445² = 882919686227116050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7786 + ... + 37275.

It is an arithmetic number, because the mean of its divisors is an integer number (66511512).

Almost surely, 2^664424445 is an apocalyptic number.

It is an amenable number.

664424445 is a deficient number, since it is larger than the sum of its proper divisors (399759747).

664424445 is a wasteful number, since it uses less digits than its factorization.

664424445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46052.

The product of its digits is 368640, while the sum is 39.

The square root of 664424445 is about 25776.4319679819. The cubic root of 664424445 is about 872.5999841631.

The spelling of 664424445 in words is "six hundred sixty-four million, four hundred twenty-four thousand, four hundred forty-five".