3656020988729 has 4 divisors (see below), whose sum is σ = 3664163574900. Its totient is φ = 3647878402560.

The previous prime is 3656020988629. The next prime is 3656020988731. The reversal of 3656020988729 is 9278890206563.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1278195308329 + 2377825680400 = 1130573^2 + 1542020^2 .

It is a cyclic number.

It is not a de Polignac number, because 3656020988729 - 2³⁶ = 3587301511993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3656020988759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4071292412 + ... + 4071293309.

It is an arithmetic number, because the mean of its divisors is an integer number (916040893725).

Almost surely, 2^{3656020988729} is an apocalyptic number.

It is an amenable number.

3656020988729 is a deficient number, since it is larger than the sum of its proper divisors (8142586171).

3656020988729 is an equidigital number, since it uses as much as digits as its factorization.

3656020988729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8142586170.

The product of its (nonzero) digits is 78382080, while the sum is 65.

The spelling of 3656020988729 in words is "three trillion, six hundred fifty-six billion, twenty million, nine hundred eighty-eight thousand, seven hundred twenty-nine".