6566661765 has 48 divisors (see below), whose sum is σ = 11998445760. Its totient is φ = 3407469120.

The previous prime is 6566661733. The next prime is 6566661799. The reversal of 6566661765 is 5671666656.

It is not a de Polignac number, because 6566661765 - 2⁵ = 6566661733 is a prime.

It is a super-3 number, since 3×6566661765³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 167050 + ... + 202580.

It is an arithmetic number, because the mean of its divisors is an integer number (249967620).

Almost surely, 2^6566661765 is an apocalyptic number.

It is an amenable number.

6566661765 is a deficient number, since it is larger than the sum of its proper divisors (5431783995).

6566661765 is a wasteful number, since it uses less digits than its factorization.

6566661765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35619 (or 35576 counting only the distinct ones).

The product of its digits is 8164800, while the sum is 54.

The square root of 6566661765 is about 81034.9416301388. The cubic root of 6566661765 is about 1872.6137836731.

The spelling of 6566661765 in words is "six billion, five hundred sixty-six million, six hundred sixty-one thousand, seven hundred sixty-five".