665669175293 has 4 divisors (see below), whose sum is σ = 687142374528. Its totient is φ = 644195976060.

The previous prime is 665669175251. The next prime is 665669175299. The reversal of 665669175293 is 392571966566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 665669175293 - 2²⁶ = 665602066429 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 (665669175299) 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, 10736599571 + ... + 10736599632.

It is an arithmetic number, because the mean of its divisors is an integer number (171785593632).

Almost surely, 2^665669175293 is an apocalyptic number.

It is an amenable number.

665669175293 is a deficient number, since it is larger than the sum of its proper divisors (21473199235).

665669175293 is a wasteful number, since it uses less digits than its factorization.

665669175293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21473199234.

The product of its digits is 110224800, while the sum is 65.

The spelling of 665669175293 in words is "six hundred sixty-five billion, six hundred sixty-nine million, one hundred seventy-five thousand, two hundred ninety-three".