664360426 has 16 divisors (see below), whose sum is σ = 1011681288. Its totient is φ = 327168000.

The previous prime is 664360423. The next prime is 664360427. The reversal of 664360426 is 624063466.

It can be written as a sum of positive squares in 4 ways, for example, as 664350625 + 9801 = 25775^2 + 99^2 .

It is not an unprimeable number, because it can be changed into a prime (664360423) 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 7 ways as a sum of consecutive naturals, for example, 30466 + ... + 47506.

Almost surely, 2^664360426 is an apocalyptic number.

664360426 is a deficient number, since it is larger than the sum of its proper divisors (347320862).

664360426 is a wasteful number, since it uses less digits than its factorization.

664360426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17337.

The product of its (nonzero) digits is 124416, while the sum is 37.

The square root of 664360426 is about 25775.1901253900. The cubic root of 664360426 is about 872.5719575139.

The spelling of 664360426 in words is "six hundred sixty-four million, three hundred sixty thousand, four hundred twenty-six".