666595765 has 8 divisors (see below), whose sum is σ = 872634528. Its totient is φ = 484796880.

The previous prime is 666595763. The next prime is 666595793. The reversal of 666595765 is 567595666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 666595765 - 2¹ = 666595763 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55), and also a Moran number because the ratio is a prime number: 12119923 = 666595765 / (6 + 6 + 6 + 5 + 9 + 5 + 7 + 6 + 5).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666595763) 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, 6059907 + ... + 6060016.

It is an arithmetic number, because the mean of its divisors is an integer number (109079316).

Almost surely, 2^666595765 is an apocalyptic number.

It is an amenable number.

666595765 is a deficient number, since it is larger than the sum of its proper divisors (206038763).

666595765 is a wasteful number, since it uses less digits than its factorization.

666595765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12119939.

The product of its digits is 10206000, while the sum is 55.

The square root of 666595765 is about 25818.5159333375. The cubic root of 666595765 is about 873.5494944829.

Subtracting from 666595765 its reverse (567595666), we obtain a palindrome (99000099).

The spelling of 666595765 in words is "six hundred sixty-six million, five hundred ninety-five thousand, seven hundred sixty-five".