6386387661 has 24 divisors (see below), whose sum is σ = 9340582680. Its totient is φ = 4204368000.

The previous prime is 6386387653. The next prime is 6386387663. The reversal of 6386387661 is 1667836836.

It can be written as a sum of positive squares in 4 ways, for example, as 2740522500 + 3645865161 = 52350^2 + 60381^2 .

It is not a de Polignac number, because 6386387661 - 2³ = 6386387653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6386387598 and 6386387607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6386387663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 344571 + ... + 362631.

It is an arithmetic number, because the mean of its divisors is an integer number (389190945).

Almost surely, 2^6386387661 is an apocalyptic number.

It is an amenable number.

6386387661 is a deficient number, since it is larger than the sum of its proper divisors (2954195019).

6386387661 is a wasteful number, since it uses less digits than its factorization.

6386387661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18557 (or 18554 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The square root of 6386387661 is about 79914.8775948509. The cubic root of 6386387661 is about 1855.3182890940.

The spelling of 6386387661 in words is "six billion, three hundred eighty-six million, three hundred eighty-seven thousand, six hundred sixty-one".