664042472 has 8 divisors (see below), whose sum is σ = 1245079650. Its totient is φ = 332021232.

The previous prime is 664042469. The next prime is 664042501. The reversal of 664042472 is 274240466.

It can be written as a sum of positive squares in only one way, i.e., 655667236 + 8375236 = 25606^2 + 2894^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×664042472³ (a number of 27 digits) contains 333 as substring.

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 as a sum of consecutive naturals, namely, 41502647 + ... + 41502662.

Almost surely, 2^664042472 is an apocalyptic number.

It is an amenable number.

664042472 is a deficient number, since it is larger than the sum of its proper divisors (581037178).

664042472 is a wasteful number, since it uses less digits than its factorization.

664042472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83005315 (or 83005311 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 35.

The square root of 664042472 is about 25769.0215569004. The cubic root of 664042472 is about 872.4327348849.

The spelling of 664042472 in words is "six hundred sixty-four million, forty-two thousand, four hundred seventy-two".