8126564691 has 12 divisors (see below), whose sum is σ = 12604467912. Its totient is φ = 4643751168.

The previous prime is 8126564687. The next prime is 8126564707. The reversal of 8126564691 is 1964656218.

It is not a de Polignac number, because 8126564691 - 2² = 8126564687 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8126564691.

It is not an unprimeable number, because it can be changed into a prime (8126564681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27641230 + ... + 27641523.

It is an arithmetic number, because the mean of its divisors is an integer number (1050372326).

Almost surely, 2^8126564691 is an apocalyptic number.

8126564691 is a deficient number, since it is larger than the sum of its proper divisors (4477903221).

8126564691 is a wasteful number, since it uses less digits than its factorization.

8126564691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55282770 (or 55282763 counting only the distinct ones).

The product of its digits is 622080, while the sum is 48.

The square root of 8126564691 is about 90147.4608128260. The cubic root of 8126564691 is about 2010.4919211326.

The spelling of 8126564691 in words is "eight billion, one hundred twenty-six million, five hundred sixty-four thousand, six hundred ninety-one".