6601321331 has 16 divisors (see below), whose sum is σ = 7258982400. Its totient is φ = 5953432320.

The previous prime is 6601321267. The next prime is 6601321361. The reversal of 6601321331 is 1331231066.

It is not a de Polignac number, because 6601321331 - 2⁶ = 6601321267 is a prime.

It is a super-2 number, since 2×6601321331² = 87154886630231223122, which contains 22 as substring.

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 6601321331.

It is not an unprimeable number, because it can be changed into a prime (6601321361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 768446 + ... + 776988.

It is an arithmetic number, because the mean of its divisors is an integer number (453686400).

Almost surely, 2^6601321331 is an apocalyptic number.

6601321331 is a deficient number, since it is larger than the sum of its proper divisors (657661069).

6601321331 is a wasteful number, since it uses less digits than its factorization.

6601321331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9106.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 6601321331 is about 81248.5158695222. The cubic root of 6601321331 is about 1875.9026249385.

Adding to 6601321331 its reverse (1331231066), we get a palindrome (7932552397).

The spelling of 6601321331 in words is "six billion, six hundred one million, three hundred twenty-one thousand, three hundred thirty-one".