8115861896971 has 2 divisors, whose sum is σ = 8115861896972. Its totient is φ = 8115861896970.

The previous prime is 8115861896941. The next prime is 8115861897067. The reversal of 8115861896971 is 1796981685118.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8115861896971 - 2⁷ = 8115861896843 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8115861896971.

It is not a weakly prime, because it can be changed into another prime (8115861896941) 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, 4057930948485 + 4057930948486.

It is an arithmetic number, because the mean of its divisors is an integer number (4057930948486).

Almost surely, 2^{8115861896971} is an apocalyptic number.

8115861896971 is a deficient number, since it is larger than the sum of its proper divisors (1).

8115861896971 is an equidigital number, since it uses as much as digits as its factorization.

8115861896971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52254720, while the sum is 70.

The spelling of 8115861896971 in words is "eight trillion, one hundred fifteen billion, eight hundred sixty-one million, eight hundred ninety-six thousand, nine hundred seventy-one".