665541593836 has 12 divisors (see below), whose sum is σ = 1331083187728. Its totient is φ = 285232111632.

The previous prime is 665541593833. The next prime is 665541593887. The reversal of 665541593836 is 638395145566.

665541593836 is an admirable number.

It is a super-2 number, since 2×665541593836² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (61) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (665541593833) 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, 11884671291 + ... + 11884671346.

Almost surely, 2^665541593836 is an apocalyptic number.

It is an amenable number.

665541593836 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665541593836 is a wasteful number, since it uses less digits than its factorization.

665541593836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23769342648 (or 23769342646 counting only the distinct ones).

The product of its digits is 69984000, while the sum is 61.

The spelling of 665541593836 in words is "six hundred sixty-five billion, five hundred forty-one million, five hundred ninety-three thousand, eight hundred thirty-six".