6446323521 has 45 divisors (see below), whose sum is σ = 10597771569. Its totient is φ = 3902045400.

The previous prime is 6446323487. The next prime is 6446323537. The reversal of 6446323521 is 1253236446.

The square root of 6446323521 is 80289.

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

6446323521 is a `hidden beast` number, since 64 + 46 + 32 + 3 + 521 = 666.

It is not a de Polignac number, because 6446323521 - 2¹³ = 6446315329 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (6446323561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 7948206 + ... + 7949016.

Almost surely, 2^6446323521 is an apocalyptic number.

6446323521 is the 80289-th square number.

6446323521 is the 40145-th centered octagonal number.

It is an amenable number.

6446323521 is a deficient number, since it is larger than the sum of its proper divisors (4151448048).

6446323521 is an frugal number, since it uses more digits than its factorization.

6446323521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1656 (or 825 counting only the distinct ones).

The product of its digits is 103680, while the sum is 36.

The cubic root of 6446323521 is about 1861.1042428477.

Multiplying 6446323521 by its sum of digits (36), we get a square (232067646756 = 481734²).

Adding to 6446323521 its reverse (1253236446), we get a palindrome (7699559967).

The spelling of 6446323521 in words is "six billion, four hundred forty-six million, three hundred twenty-three thousand, five hundred twenty-one".