84661222189 has 2 divisors, whose sum is σ = 84661222190. Its totient is φ = 84661222188.

The previous prime is 84661222141. The next prime is 84661222201. The reversal of 84661222189 is 98122216648.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84612919689 + 48302500 = 290883^2 + 6950^2 .

It is a cyclic number.

It is not a de Polignac number, because 84661222189 - 2¹⁵ = 84661189421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84661222889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42330611094 + 42330611095.

It is an arithmetic number, because the mean of its divisors is an integer number (42330611095).

Almost surely, 2^84661222189 is an apocalyptic number.

It is an amenable number.

84661222189 is a deficient number, since it is larger than the sum of its proper divisors (1).

84661222189 is an equidigital number, since it uses as much as digits as its factorization.

84661222189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 663552, while the sum is 49.

The spelling of 84661222189 in words is "eighty-four billion, six hundred sixty-one million, two hundred twenty-two thousand, one hundred eighty-nine".