5665344435666 has 24 divisors (see below), whose sum is σ = 12275049157020. Its totient is φ = 1888427189376.

The previous prime is 5665344435649. The next prime is 5665344435743. The reversal of 5665344435666 is 6665344435665.

It can be written as a sum of positive squares in 2 ways, for example, as 5440654215441 + 224690220225 = 2332521^2 + 474015^2 .

It is a super-2 number, since 2×5665344435666² (a number of 26 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33795 + ... + 3366278.

Almost surely, 2^{5665344435666} is an apocalyptic number.

5665344435666 is an abundant number, since it is smaller than the sum of its proper divisors (6609704721354).

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

5665344435666 is a wasteful number, since it uses less digits than its factorization.

5665344435666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3492650 (or 3492647 counting only the distinct ones).

The product of its digits is 559872000, while the sum is 63.

Subtracting 5665344435666 from its reverse (6665344435665), we obtain a palindrome (999999999999).

The spelling of 5665344435666 in words is "five trillion, six hundred sixty-five billion, three hundred forty-four million, four hundred thirty-five thousand, six hundred sixty-six".