39636679681 has 16 divisors (see below), whose sum is σ = 43117650000. Its totient is φ = 36284129280.

The previous prime is 39636679679. The next prime is 39636679757. The reversal of 39636679681 is 18697663693.

It can be written as a sum of positive squares in 8 ways, for example, as 11886450625 + 27750229056 = 109025^2 + 166584^2 .

It is a cyclic number.

It is not a de Polignac number, because 39636679681 - 2¹ = 39636679679 is a prime.

It is a super-2 number, since 2×39636679681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39636679661) 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, 2104695 + ... + 2123443.

It is an arithmetic number, because the mean of its divisors is an integer number (2694853125).

Almost surely, 2^39636679681 is an apocalyptic number.

It is an amenable number.

39636679681 is a deficient number, since it is larger than the sum of its proper divisors (3480970319).

39636679681 is a wasteful number, since it uses less digits than its factorization.

39636679681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22164.

The product of its digits is 52907904, while the sum is 64.

The spelling of 39636679681 in words is "thirty-nine billion, six hundred thirty-six million, six hundred seventy-nine thousand, six hundred eighty-one".