6681520171 has 8 divisors (see below), whose sum is σ = 7008528384. Its totient is φ = 6357554280.

The previous prime is 6681520103. The next prime is 6681520189. The reversal of 6681520171 is 1710251866.

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 6681520171 - 2²¹ = 6679423019 is a prime.

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 6681520171.

It is not an unprimeable number, because it can be changed into a prime (6681520271) 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, 756081 + ... + 764866.

It is an arithmetic number, because the mean of its divisors is an integer number (876066048).

Almost surely, 2^6681520171 is an apocalyptic number.

6681520171 is a deficient number, since it is larger than the sum of its proper divisors (327008213).

6681520171 is a wasteful number, since it uses less digits than its factorization.

6681520171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1521161.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 6681520171 is about 81740.5662507913. The cubic root of 6681520171 is about 1883.4687892305.

The spelling of 6681520171 in words is "six billion, six hundred eighty-one million, five hundred twenty thousand, one hundred seventy-one".