8556097691 has 2 divisors, whose sum is σ = 8556097692. Its totient is φ = 8556097690.

The previous prime is 8556097663. The next prime is 8556097699. The reversal of 8556097691 is 1967906558.

8556097691 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8556097691 is a prime.

It is not a weakly prime, because it can be changed into another prime (8556097699) 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, 4278048845 + 4278048846.

It is an arithmetic number, because the mean of its divisors is an integer number (4278048846).

Almost surely, 2^8556097691 is an apocalyptic number.

8556097691 is a deficient number, since it is larger than the sum of its proper divisors (1).

8556097691 is an equidigital number, since it uses as much as digits as its factorization.

8556097691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4082400, while the sum is 56.

The square root of 8556097691 is about 92499.1767044442. The cubic root of 8556097691 is about 2045.3073460384.

The spelling of 8556097691 in words is "eight billion, five hundred fifty-six million, ninety-seven thousand, six hundred ninety-one".