3639688688691 has 24 divisors (see below), whose sum is σ = 5738858549424. Its totient is φ = 2204490576960.

The previous prime is 3639688688689. The next prime is 3639688688707. The reversal of 3639688688691 is 1968868869363.

3639688688691 is a `hidden beast` number, since 3 + 6 + 396 + 8 + 8 + 68 + 86 + 91 = 666.

It is not a de Polignac number, because 3639688688691 - 2¹ = 3639688688689 is a prime.

It is a super-2 number, since 2×3639688688691² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3639688688691.

It is not an unprimeable number, because it can be changed into a prime (3639688688291) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11352396 + ... + 11668601.

It is an arithmetic number, because the mean of its divisors is an integer number (239119106226).

Almost surely, 2^{3639688688691} is an apocalyptic number.

3639688688691 is a deficient number, since it is larger than the sum of its proper divisors (2099169860733).

3639688688691 is a wasteful number, since it uses less digits than its factorization.

3639688688691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23022611 (or 23022608 counting only the distinct ones).

The product of its digits is 3869835264, while the sum is 81.

The spelling of 3639688688691 in words is "three trillion, six hundred thirty-nine billion, six hundred eighty-eight million, six hundred eighty-eight thousand, six hundred ninety-one".