5665637681 has 8 divisors (see below), whose sum is σ = 6208414464. Its totient is φ = 5127480720.

The previous prime is 5665637647. The next prime is 5665637699. The reversal of 5665637681 is 1867365665.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5665637681 is a prime.

It is a super-2 number, since 2×5665637681² = 64198900664734115522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5665637641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1152386 + ... + 1157291.

It is an arithmetic number, because the mean of its divisors is an integer number (776051808).

Almost surely, 2^5665637681 is an apocalyptic number.

It is an amenable number.

5665637681 is a deficient number, since it is larger than the sum of its proper divisors (542776783).

5665637681 is a wasteful number, since it uses less digits than its factorization.

5665637681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2309911.

The product of its digits is 5443200, while the sum is 53.

The square root of 5665637681 is about 75270.4303229362. The cubic root of 5665637681 is about 1782.7191619094.

It can be divided in two parts, 5665 and 637681, that added together give a palindrome (643346).

The spelling of 5665637681 in words is "five billion, six hundred sixty-five million, six hundred thirty-seven thousand, six hundred eighty-one".