7868565491 has 2 divisors, whose sum is σ = 7868565492. Its totient is φ = 7868565490.

The previous prime is 7868565473. The next prime is 7868565527. The reversal of 7868565491 is 1945658687.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7868565491 - 2⁶ = 7868565427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7868565491.

It is not a weakly prime, because it can be changed into another prime (7868562491) 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 as a sum of consecutive naturals, namely, 3934282745 + 3934282746.

It is an arithmetic number, because the mean of its divisors is an integer number (3934282746).

Almost surely, 2^7868565491 is an apocalyptic number.

7868565491 is a deficient number, since it is larger than the sum of its proper divisors (1).

7868565491 is an equidigital number, since it uses as much as digits as its factorization.

7868565491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14515200, while the sum is 59.

The square root of 7868565491 is about 88704.9349867300. The cubic root of 7868565491 is about 1988.9865879504.

The spelling of 7868565491 in words is "seven billion, eight hundred sixty-eight million, five hundred sixty-five thousand, four hundred ninety-one".