664675061 has 16 divisors (see below), whose sum is σ = 738823680. Its totient is φ = 595107840.

The previous prime is 664675049. The next prime is 664675069. The reversal of 664675061 is 160576466.

It is a cyclic number.

It is not a de Polignac number, because 664675061 - 2¹⁰ = 664674037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664675069) 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, 20405 + ... + 41781.

It is an arithmetic number, because the mean of its divisors is an integer number (46176480).

Almost surely, 2^664675061 is an apocalyptic number.

It is an amenable number.

664675061 is a deficient number, since it is larger than the sum of its proper divisors (74148619).

664675061 is a wasteful number, since it uses less digits than its factorization.

664675061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21484.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 664675061 is about 25781.2928496614. The cubic root of 664675061 is about 872.7096831311.

The spelling of 664675061 in words is "six hundred sixty-four million, six hundred seventy-five thousand, sixty-one".