8000556491 has 2 divisors, whose sum is σ = 8000556492. Its totient is φ = 8000556490.

The previous prime is 8000556481. The next prime is 8000556503. The reversal of 8000556491 is 1946550008.

8000556491 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8000556491 - 2⁶ = 8000556427 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (8000556451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4000278245 + 4000278246.

It is an arithmetic number, because the mean of its divisors is an integer number (4000278246).

Almost surely, 2^8000556491 is an apocalyptic number.

8000556491 is a deficient number, since it is larger than the sum of its proper divisors (1).

8000556491 is an equidigital number, since it uses as much as digits as its factorization.

8000556491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 8000556491 is about 89445.8299251564. The cubic root of 8000556491 is about 2000.0463731748.

The spelling of 8000556491 in words is "eight billion, five hundred fifty-six thousand, four hundred ninety-one".