6661660519 has 8 divisors (see below), whose sum is σ = 6740100000. Its totient is φ = 6583671072.

The previous prime is 6661660517. The next prime is 6661660541. The reversal of 6661660519 is 9150661666.

6661660519 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 6661660519 - 2¹ = 6661660517 is a prime.

It is a super-2 number, since 2×6661660519² = 88755441740806698722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661660513) 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, 82684 + ... + 141985.

It is an arithmetic number, because the mean of its divisors is an integer number (842512500).

Almost surely, 2^6661660519 is an apocalyptic number.

6661660519 is a deficient number, since it is larger than the sum of its proper divisors (78439481).

6661660519 is a wasteful number, since it uses less digits than its factorization.

6661660519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225017.

The product of its (nonzero) digits is 349920, while the sum is 46.

The square root of 6661660519 is about 81618.9960670921. The cubic root of 6661660519 is about 1881.6008432619.

The spelling of 6661660519 in words is "six billion, six hundred sixty-one million, six hundred sixty thousand, five hundred nineteen".