664129169 has 16 divisors (see below), whose sum is σ = 746862336. Its totient is φ = 585244800.

The previous prime is 664129159. The next prime is 664129171. The reversal of 664129169 is 961921466.

It is a cyclic number.

It is not a de Polignac number, because 664129169 - 2¹² = 664125073 is a prime.

It is a super-2 number, since 2×664129169² = 882135106233261122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664129159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111464 + ... + 117270.

It is an arithmetic number, because the mean of its divisors is an integer number (46678896).

Almost surely, 2^664129169 is an apocalyptic number.

It is an amenable number.

664129169 is a deficient number, since it is larger than the sum of its proper divisors (82733167).

664129169 is a wasteful number, since it uses less digits than its factorization.

664129169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6136.

The product of its digits is 139968, while the sum is 44.

The square root of 664129169 is about 25770.7036962517. The cubic root of 664129169 is about 872.4707013366.

The spelling of 664129169 in words is "six hundred sixty-four million, one hundred twenty-nine thousand, one hundred sixty-nine".