3656378861 has 2 divisors, whose sum is σ = 3656378862. Its totient is φ = 3656378860.

The previous prime is 3656378851. The next prime is 3656378863. The reversal of 3656378861 is 1688736563.

It is a happy number.

3656378861 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2459564836 + 1196814025 = 49594^2 + 34595^2 .

It is a cyclic number.

It is not a de Polignac number, because 3656378861 - 2⁶ = 3656378797 is a prime.

Together with 3656378863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3656378863) 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 as a sum of consecutive naturals, namely, 1828189430 + 1828189431.

It is an arithmetic number, because the mean of its divisors is an integer number (1828189431).

Almost surely, 2^3656378861 is an apocalyptic number.

It is an amenable number.

3656378861 is a deficient number, since it is larger than the sum of its proper divisors (1).

3656378861 is an equidigital number, since it uses as much as digits as its factorization.

3656378861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4354560, while the sum is 53.

The square root of 3656378861 is about 60467.9986521797. The cubic root of 3656378861 is about 1540.5781352415.

The spelling of 3656378861 in words is "three billion, six hundred fifty-six million, three hundred seventy-eight thousand, eight hundred sixty-one".