664512433 has 16 divisors (see below), whose sum is σ = 725343696. Its totient is φ = 605122560.

The previous prime is 664512427. The next prime is 664512437. The reversal of 664512433 is 334215466.

It can be written as a sum of positive squares in 8 ways, for example, as 68029504 + 596482929 = 8248^2 + 24423^2 .

It is a cyclic number.

It is not a de Polignac number, because 664512433 - 2²⁵ = 630958001 is a prime.

It is a super-2 number, since 2×664512433² = 883153547223158978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664512437) 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, 353091 + ... + 354967.

It is an arithmetic number, because the mean of its divisors is an integer number (45333981).

Almost surely, 2^664512433 is an apocalyptic number.

It is an amenable number.

664512433 is a deficient number, since it is larger than the sum of its proper divisors (60831263).

664512433 is a wasteful number, since it uses less digits than its factorization.

664512433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2244.

The product of its digits is 51840, while the sum is 34.

The square root of 664512433 is about 25778.1386643799. The cubic root of 664512433 is about 872.6385011779.

Adding to 664512433 its reverse (334215466), we get a palindrome (998727899).

The spelling of 664512433 in words is "six hundred sixty-four million, five hundred twelve thousand, four hundred thirty-three".