664434361 has 4 divisors (see below), whose sum is σ = 664596724. Its totient is φ = 664272000.

The previous prime is 664434301. The next prime is 664434391. The reversal of 664434361 is 163434466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 134560000 + 529874361 = 11600^2 + 23019^2 .

It is a cyclic number.

It is not a de Polignac number, because 664434361 - 2⁹ = 664433849 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664434361.

It is not an unprimeable number, because it can be changed into a prime (664434301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74880 + ... + 83281.

It is an arithmetic number, because the mean of its divisors is an integer number (166149181).

Almost surely, 2^664434361 is an apocalyptic number.

It is an amenable number.

664434361 is a deficient number, since it is larger than the sum of its proper divisors (162363).

664434361 is a wasteful number, since it uses less digits than its factorization.

664434361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162362.

The product of its digits is 124416, while the sum is 37.

The square root of 664434361 is about 25776.6243135132. The cubic root of 664434361 is about 872.6043250923.

The spelling of 664434361 in words is "six hundred sixty-four million, four hundred thirty-four thousand, three hundred sixty-one".