6665751819 has 32 divisors (see below), whose sum is σ = 10222977600. Its totient is φ = 4287548160.

The previous prime is 6665751809. The next prime is 6665751821. The reversal of 6665751819 is 9181575666.

It is not a de Polignac number, because 6665751819 - 2⁵ = 6665751787 is a prime.

It is a super-2 number, since 2×6665751819² = 88864494625003617522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6665751809) 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 31 ways as a sum of consecutive naturals, for example, 1737127 + ... + 1740959.

It is an arithmetic number, because the mean of its divisors is an integer number (319468050).

Almost surely, 2^6665751819 is an apocalyptic number.

6665751819 is a deficient number, since it is larger than the sum of its proper divisors (3557225781).

6665751819 is a wasteful number, since it uses less digits than its factorization.

6665751819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6092 (or 6086 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 54.

The square root of 6665751819 is about 81644.0556256241. The cubic root of 6665751819 is about 1881.9859633622.

The spelling of 6665751819 in words is "six billion, six hundred sixty-five million, seven hundred fifty-one thousand, eight hundred nineteen".