665361656341199 has 16 divisors (see below), whose sum is σ = 704747263979520. Its totient is φ = 626003474127360.

The previous prime is 665361656341183. The next prime is 665361656341243. The reversal of 665361656341199 is 991143656163566.

It is a cyclic number.

It is not a de Polignac number, because 665361656341199 - 2⁴ = 665361656341183 is a prime.

It is a super-2 number, since 2×665361656341199² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665361656344199) 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, 1433079017 + ... + 1433543229.

It is an arithmetic number, because the mean of its divisors is an integer number (44046703998720).

Almost surely, 2^{665361656341199} is an apocalyptic number.

665361656341199 is a deficient number, since it is larger than the sum of its proper divisors (39385607638321).

665361656341199 is a wasteful number, since it uses less digits than its factorization.

665361656341199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493570.

The product of its digits is 566870400, while the sum is 71.

The spelling of 665361656341199 in words is "six hundred sixty-five trillion, three hundred sixty-one billion, six hundred fifty-six million, three hundred forty-one thousand, one hundred ninety-nine".