664513443 has 64 divisors (see below), whose sum is σ = 1118261760. Its totient is φ = 386467200.

The previous prime is 664513439. The next prime is 664513457. The reversal of 664513443 is 344315466.

664513443 is a `hidden beast` number, since 6 + 645 + 1 + 3 + 4 + 4 + 3 = 666.

It is not a de Polignac number, because 664513443 - 2² = 664513439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664513398 and 664513407.

It is not an unprimeable number, because it can be changed into a prime (664513433) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 778605 + ... + 779457.

It is an arithmetic number, because the mean of its divisors is an integer number (17472840).

Almost surely, 2^664513443 is an apocalyptic number.

664513443 is a deficient number, since it is larger than the sum of its proper divisors (453748317).

664513443 is a wasteful number, since it uses less digits than its factorization.

664513443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977 (or 971 counting only the distinct ones).

The product of its digits is 103680, while the sum is 36.

The square root of 664513443 is about 25778.1582546155. The cubic root of 664513443 is about 872.6389432887.

The spelling of 664513443 in words is "six hundred sixty-four million, five hundred thirteen thousand, four hundred forty-three".