6665751806 has 16 divisors (see below), whose sum is σ = 11642608224. Its totient is φ = 2802849504.

The previous prime is 6665751793. The next prime is 6665751809. The reversal of 6665751806 is 6081575666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665751809) 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, 4491005 + ... + 4492488.

It is an arithmetic number, because the mean of its divisors is an integer number (727663014).

Almost surely, 2^6665751806 is an apocalyptic number.

6665751806 is a deficient number, since it is larger than the sum of its proper divisors (4976856418).

6665751806 is a wasteful number, since it uses less digits than its factorization.

6665751806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8983555.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The square root of 6665751806 is about 81644.0555460102. The cubic root of 6665751806 is about 1881.9859621388.

The spelling of 6665751806 in words is "six billion, six hundred sixty-five million, seven hundred fifty-one thousand, eight hundred six".