665357753567 has 4 divisors (see below), whose sum is σ = 716539119240. Its totient is φ = 614176387896.

The previous prime is 665357753549. The next prime is 665357753617. The reversal of 665357753567 is 765357753566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 665357753567 - 2¹² = 665357749471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665357753267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25590682817 + ... + 25590682842.

It is an arithmetic number, because the mean of its divisors is an integer number (179134779810).

Almost surely, 2^665357753567 is an apocalyptic number.

665357753567 is a deficient number, since it is larger than the sum of its proper divisors (51181365673).

665357753567 is a wasteful number, since it uses less digits than its factorization.

665357753567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51181365672.

The product of its digits is 416745000, while the sum is 65.

Subtracting 665357753567 from its reverse (765357753566), we obtain a palindrome (99999999999).

The spelling of 665357753567 in words is "six hundred sixty-five billion, three hundred fifty-seven million, seven hundred fifty-three thousand, five hundred sixty-seven".