665727276657 has 8 divisors (see below), whose sum is σ = 891172769760. Its totient is φ = 442049984000.

The previous prime is 665727276593. The next prime is 665727276659. The reversal of 665727276657 is 756672727566.

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 665727276657 - 2⁶ = 665727276593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665727276659) 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, 442049232 + ... + 442050737.

It is an arithmetic number, because the mean of its divisors is an integer number (111396596220).

Almost surely, 2^665727276657 is an apocalyptic number.

It is an amenable number.

665727276657 is a deficient number, since it is larger than the sum of its proper divisors (225445493103).

665727276657 is a wasteful number, since it uses less digits than its factorization.

665727276657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884100223.

The product of its digits is 311169600, while the sum is 66.

The spelling of 665727276657 in words is "six hundred sixty-five billion, seven hundred twenty-seven million, two hundred seventy-six thousand, six hundred fifty-seven".