664372546 has 16 divisors (see below), whose sum is σ = 1065632760. Its totient is φ = 309548800.

The previous prime is 664372531. The next prime is 664372547. The reversal of 664372546 is 645273466.

It can be written as a sum of positive squares in 4 ways, for example, as 595896921 + 68475625 = 24411^2 + 8275^2 .

It is not an unprimeable number, because it can be changed into a prime (664372547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93301 + ... + 100168.

Almost surely, 2^664372546 is an apocalyptic number.

664372546 is a deficient number, since it is larger than the sum of its proper divisors (401260214).

664372546 is a wasteful number, since it uses less digits than its factorization.

664372546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193589.

The product of its digits is 725760, while the sum is 43.

The square root of 664372546 is about 25775.4252341256. The cubic root of 664372546 is about 872.5772636235.

The spelling of 664372546 in words is "six hundred sixty-four million, three hundred seventy-two thousand, five hundred forty-six".