6404832223729 has 3 divisors (see below), whose sum is σ = 6404834754507. Its totient is φ = 6404829692952.

The previous prime is 6404832223723. The next prime is 6404832223793. The reversal of 6404832223729 is 9273222384046.

The square root of 6404832223729 is 2530777.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 5576280802225 + 828551421504 = 2361415^2 + 910248^2 .

It is not a de Polignac number, because 6404832223729 - 2⁹ = 6404832223217 is a prime.

It is a super-2 number, since 2×6404832223729² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6404832223723) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1265389 + ... + 3796165.

It is an arithmetic number, because the mean of its divisors is an integer number (2134944918169).

Almost surely, 2^{6404832223729} is an apocalyptic number.

6404832223729 is the 2530777-th square number.

6404832223729 is the 1265389-th centered octagonal number.

It is an amenable number.

6404832223729 is a deficient number, since it is larger than the sum of its proper divisors (2530778).

6404832223729 is an frugal number, since it uses more digits than its factorization.

6404832223729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5061554 (or 2530777 counting only the distinct ones).

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

The spelling of 6404832223729 in words is "six trillion, four hundred four billion, eight hundred thirty-two million, two hundred twenty-three thousand, seven hundred twenty-nine".