6660243522065 has 12 divisors (see below), whose sum is σ = 9297156263796. Its totient is φ = 4567024129248.

The previous prime is 6660243522043. The next prime is 6660243522067. The reversal of 6660243522065 is 5602253420666.

It can be written as a sum of positive squares in 2 ways, for example, as 3495149899024 + 3165093623041 = 1869532^2 + 1779071^2 .

It is not a de Polignac number, because 6660243522065 - 2¹⁸ = 6660243259921 is a prime.

It is a super-2 number, since 2×6660243522065² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6660243522067) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13592333474 + ... + 13592333963.

It is an arithmetic number, because the mean of its divisors is an integer number (774763021983).

Almost surely, 2^{6660243522065} is an apocalyptic number.

It is an amenable number.

6660243522065 is a deficient number, since it is larger than the sum of its proper divisors (2636912741731).

6660243522065 is a wasteful number, since it uses less digits than its factorization.

6660243522065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27184667456 (or 27184667449 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 47.

The spelling of 6660243522065 in words is "six trillion, six hundred sixty billion, two hundred forty-three million, five hundred twenty-two thousand, sixty-five".