80805061861913 has 2 divisors, whose sum is σ = 80805061861914. Its totient is φ = 80805061861912.

The previous prime is 80805061861891. The next prime is 80805061861981. The reversal of 80805061861913 is 31916816050808.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51692691996169 + 29112369865744 = 7189763^2 + 5395588^2 .

It is a cyclic number.

It is not a de Polignac number, because 80805061861913 - 2²⁴ = 80805045084697 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (80805061861313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40402530930956 + 40402530930957.

It is an arithmetic number, because the mean of its divisors is an integer number (40402530930957).

Almost surely, 2^{80805061861913} is an apocalyptic number.

It is an amenable number.

80805061861913 is a deficient number, since it is larger than the sum of its proper divisors (1).

80805061861913 is an equidigital number, since it uses as much as digits as its factorization.

80805061861913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2488320, while the sum is 56.

The spelling of 80805061861913 in words is "eighty trillion, eight hundred five billion, sixty-one million, eight hundred sixty-one thousand, nine hundred thirteen".