80809285517 has 2 divisors, whose sum is σ = 80809285518. Its totient is φ = 80809285516.

The previous prime is 80809285483. The next prime is 80809285537. The reversal of 80809285517 is 71558290808.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44559410281 + 36249875236 = 211091^2 + 190394^2 .

It is a cyclic number.

It is not a de Polignac number, because 80809285517 - 2²⁶ = 80742176653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80809285537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40404642758 + 40404642759.

It is an arithmetic number, because the mean of its divisors is an integer number (40404642759).

Almost surely, 2^80809285517 is an apocalyptic number.

It is an amenable number.

80809285517 is a deficient number, since it is larger than the sum of its proper divisors (1).

80809285517 is an equidigital number, since it uses as much as digits as its factorization.

80809285517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1612800, while the sum is 53.

The spelling of 80809285517 in words is "eighty billion, eight hundred nine million, two hundred eighty-five thousand, five hundred seventeen".