664474413409 has 9 divisors (see below), whose sum is σ = 665949028017. Its totient is φ = 663003062244.

The previous prime is 664474413371. The next prime is 664474413439. The reversal of 664474413409 is 904314474466.

The square root of 664474413409 is 815153.

It is a perfect power (a square), and thus also a powerful number.

664474413409 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 664474413409 - 2⁹ = 664474412897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664474413439) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 723040252 + ... + 723041170.

Almost surely, 2^664474413409 is an apocalyptic number.

664474413409 is the 815153-rd square number.

664474413409 is the 407577-th centered octagonal number.

It is an amenable number.

664474413409 is a deficient number, since it is larger than the sum of its proper divisors (1474614608).

664474413409 is an frugal number, since it uses more digits than its factorization.

664474413409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3612 (or 1806 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 52.

The spelling of 664474413409 in words is "six hundred sixty-four billion, four hundred seventy-four million, four hundred thirteen thousand, four hundred nine".