664140170 has 16 divisors (see below), whose sum is σ = 1199537640. Its totient is φ = 264748224.

The previous prime is 664140151. The next prime is 664140179. The reversal of 664140170 is 71041466.

It can be written as a sum of positive squares in 4 ways, for example, as 663114001 + 1026169 = 25751^2 + 1013^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (664140179) 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, 110405 + ... + 116264.

Almost surely, 2^664140170 is an apocalyptic number.

664140170 is a deficient number, since it is larger than the sum of its proper divisors (535397470).

664140170 is a wasteful number, since it uses less digits than its factorization.

664140170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226969.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 664140170 is about 25770.9171354067. The cubic root of 664140170 is about 872.4755186712.

The spelling of 664140170 in words is "six hundred sixty-four million, one hundred forty thousand, one hundred seventy".