3861266689 has 6 divisors (see below), whose sum is σ = 4491677634. Its totient is φ = 3309657120.

The previous prime is 3861266687. The next prime is 3861266699. The reversal of 3861266689 is 9866621683.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2106075664 + 1755191025 = 45892^2 + 41895^2 .

It is not a de Polignac number, because 3861266689 - 2¹ = 3861266687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3861266687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39400632 + ... + 39400729.

It is an arithmetic number, because the mean of its divisors is an integer number (748612939).

Almost surely, 2^3861266689 is an apocalyptic number.

It is an amenable number.

3861266689 is a deficient number, since it is larger than the sum of its proper divisors (630410945).

3861266689 is an equidigital number, since it uses as much as digits as its factorization.

3861266689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78801375 (or 78801368 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 55.

The square root of 3861266689 is about 62139.0914722769. The cubic root of 3861266689 is about 1568.8325789368.

The spelling of 3861266689 in words is "three billion, eight hundred sixty-one million, two hundred sixty-six thousand, six hundred eighty-nine".