665635782776273 has 16 divisors (see below), whose sum is σ = 668345654148480. Its totient is φ = 662927294561664.

The previous prime is 665635782776131. The next prime is 665635782776317. The reversal of 665635782776273 is 372677287536566.

It is a cyclic number.

It is not a de Polignac number, because 665635782776273 - 2³⁸ = 665360904869329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665635782796273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18711808115 + ... + 18711843687.

It is an arithmetic number, because the mean of its divisors is an integer number (41771603384280).

Almost surely, 2^{665635782776273} is an apocalyptic number.

It is an amenable number.

665635782776273 is a deficient number, since it is larger than the sum of its proper divisors (2709871372207).

665635782776273 is a wasteful number, since it uses less digits than its factorization.

665635782776273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52888.

The product of its digits is 22404211200, while the sum is 80.

The spelling of 665635782776273 in words is "six hundred sixty-five trillion, six hundred thirty-five billion, seven hundred eighty-two million, seven hundred seventy-six thousand, two hundred seventy-three".