664129170 has 24 divisors (see below), whose sum is σ = 1726736076. Its totient is φ = 177101088.

The previous prime is 664129159. The next prime is 664129171. The reversal of 664129170 is 71921466.

664129170 is a `hidden beast` number, since 6 + 641 + 2 + 9 + 1 + 7 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 630361449 + 33767721 = 25107^2 + 5811^2 .

It is not an unprimeable number, because it can be changed into a prime (664129171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3689517 + ... + 3689696.

Almost surely, 2^664129170 is an apocalyptic number.

664129170 is an abundant number, since it is smaller than the sum of its proper divisors (1062606906).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664129170 is a wasteful number, since it uses less digits than its factorization.

664129170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7379226 (or 7379223 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 664129170 is about 25770.7037156536. The cubic root of 664129170 is about 872.4707017745.

The spelling of 664129170 in words is "six hundred sixty-four million, one hundred twenty-nine thousand, one hundred seventy".