6661323131 has 8 divisors (see below), whose sum is σ = 6701715504. Its totient is φ = 6620997600.

The previous prime is 6661323049. The next prime is 6661323133. The reversal of 6661323131 is 1313231666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6661323131 - 2²² = 6657128827 is a prime.

It is a super-2 number, since 2×6661323131² = 88746451711191286322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6661323133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190961 + ... + 223133.

It is an arithmetic number, because the mean of its divisors is an integer number (837714438).

Almost surely, 2^6661323131 is an apocalyptic number.

6661323131 is a deficient number, since it is larger than the sum of its proper divisors (40392373).

6661323131 is a wasteful number, since it uses less digits than its factorization.

6661323131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33421.

The product of its digits is 11664, while the sum is 32.

The square root of 6661323131 is about 81616.9291936422. The cubic root of 6661323131 is about 1881.5690773950.

Adding to 6661323131 its reverse (1313231666), we get a palindrome (7974554797).

The spelling of 6661323131 in words is "six billion, six hundred sixty-one million, three hundred twenty-three thousand, one hundred thirty-one".