84259166861 has 2 divisors, whose sum is σ = 84259166862. Its totient is φ = 84259166860.

The previous prime is 84259166821. The next prime is 84259166863. The reversal of 84259166861 is 16866195248.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58186605961 + 26072560900 = 241219^2 + 161470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84259166861 is a prime.

Together with 84259166863, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 84259166797 and 84259166806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84259166863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42129583430 + 42129583431.

It is an arithmetic number, because the mean of its divisors is an integer number (42129583431).

Almost surely, 2^84259166861 is an apocalyptic number.

It is an amenable number.

84259166861 is a deficient number, since it is larger than the sum of its proper divisors (1).

84259166861 is an equidigital number, since it uses as much as digits as its factorization.

84259166861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4976640, while the sum is 56.

The spelling of 84259166861 in words is "eighty-four billion, two hundred fifty-nine million, one hundred sixty-six thousand, eight hundred sixty-one".