664171075 has 12 divisors (see below), whose sum is σ = 825658960. Its totient is φ = 529990560.

The previous prime is 664171061. The next prime is 664171097. The reversal of 664171075 is 570171466.

664171075 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 664171075 - 2²³ = 655782467 is a prime.

It is a super-3 number, since 3×664171075³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23535 + ... + 43384.

Almost surely, 2^664171075 is an apocalyptic number.

664171075 is a deficient number, since it is larger than the sum of its proper divisors (161487885).

664171075 is a wasteful number, since it uses less digits than its factorization.

664171075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67326 (or 67321 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 664171075 is about 25771.5167384460. The cubic root of 664171075 is about 872.4890516766.

The spelling of 664171075 in words is "six hundred sixty-four million, one hundred seventy-one thousand, seventy-five".