665610133243 has 16 divisors (see below), whose sum is σ = 729322030080. Its totient is φ = 602433025600.

The previous prime is 665610133229. The next prime is 665610133247. The reversal of 665610133243 is 342331016566.

It is a cyclic number.

It is not a de Polignac number, because 665610133243 - 2¹⁷ = 665610002171 is a prime.

It is a super-3 number, since 3×665610133243³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665610133196 and 665610133205.

It is not an unprimeable number, because it can be changed into a prime (665610133247) 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, 12779871 + ... + 12831847.

It is an arithmetic number, because the mean of its divisors is an integer number (45582626880).

Almost surely, 2^665610133243 is an apocalyptic number.

665610133243 is a deficient number, since it is larger than the sum of its proper divisors (63711896837).

665610133243 is a wasteful number, since it uses less digits than its factorization.

665610133243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57098.

The product of its (nonzero) digits is 233280, while the sum is 40.

The spelling of 665610133243 in words is "six hundred sixty-five billion, six hundred ten million, one hundred thirty-three thousand, two hundred forty-three".