664434161 has 16 divisors (see below), whose sum is σ = 710400000. Its totient is φ = 619618896.

The previous prime is 664434139. The next prime is 664434163. The reversal of 664434161 is 161434466.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 664434161 - 2¹⁴ = 664417777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664434163) 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, 898730 + ... + 899468.

It is an arithmetic number, because the mean of its divisors is an integer number (44400000).

Almost surely, 2^664434161 is an apocalyptic number.

It is an amenable number.

664434161 is a deficient number, since it is larger than the sum of its proper divisors (45965839).

664434161 is a wasteful number, since it uses less digits than its factorization.

664434161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436.

The product of its digits is 41472, while the sum is 35.

The square root of 664434161 is about 25776.6204340290. The cubic root of 664434161 is about 872.6042375387.

The spelling of 664434161 in words is "six hundred sixty-four million, four hundred thirty-four thousand, one hundred sixty-one".