6601131681 has 8 divisors (see below), whose sum is σ = 8907551520. Its totient is φ = 4347733152.

The previous prime is 6601131679. The next prime is 6601131697. The reversal of 6601131681 is 1861311066.

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

It is not a de Polignac number, because 6601131681 - 2¹ = 6601131679 is a prime.

It is a super-2 number, since 2×6601131681² = 87149878939803771522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6601131611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13255036 + ... + 13255533.

It is an arithmetic number, because the mean of its divisors is an integer number (1113443940).

Almost surely, 2^6601131681 is an apocalyptic number.

It is an amenable number.

6601131681 is a deficient number, since it is larger than the sum of its proper divisors (2306419839).

6601131681 is a wasteful number, since it uses less digits than its factorization.

6601131681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26510655.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 6601131681 is about 81247.3487628981. The cubic root of 6601131681 is about 1875.8846604371.

The spelling of 6601131681 in words is "six billion, six hundred one million, one hundred thirty-one thousand, six hundred eighty-one".