80185642664489 has 2 divisors, whose sum is σ = 80185642664490. Its totient is φ = 80185642664488.

The previous prime is 80185642664443. The next prime is 80185642664507. The reversal of 80185642664489 is 98446624658108.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73063859107600 + 7121783556889 = 8547740^2 + 2668667^2 .

It is a cyclic number.

It is not a de Polignac number, because 80185642664489 - 2²⁴ = 80185625887273 is a prime.

It is a super-2 number, since 2×80185642664489² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (80185642664429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40092821332244 + 40092821332245.

It is an arithmetic number, because the mean of its divisors is an integer number (40092821332245).

Almost surely, 2^{80185642664489} is an apocalyptic number.

It is an amenable number.

80185642664489 is a deficient number, since it is larger than the sum of its proper divisors (1).

80185642664489 is an equidigital number, since it uses as much as digits as its factorization.

80185642664489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 637009920, while the sum is 71.

The spelling of 80185642664489 in words is "eighty trillion, one hundred eighty-five billion, six hundred forty-two million, six hundred sixty-four thousand, four hundred eighty-nine".