664561562 has 32 divisors (see below), whose sum is σ = 1166690304. Its totient is φ = 278031600.

The previous prime is 664561549. The next prime is 664561567. The reversal of 664561562 is 265165466.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (664561567) by changing a digit.

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, 99137 + ... + 105627.

It is an arithmetic number, because the mean of its divisors is an integer number (36459072).

Almost surely, 2^664561562 is an apocalyptic number.

664561562 is a deficient number, since it is larger than the sum of its proper divisors (502128742).

664561562 is a wasteful number, since it uses less digits than its factorization.

664561562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6674.

The product of its digits is 259200, while the sum is 41.

The square root of 664561562 is about 25779.0915666165. The cubic root of 664561562 is about 872.6600060680.

The spelling of 664561562 in words is "six hundred sixty-four million, five hundred sixty-one thousand, five hundred sixty-two".