84659166709 has 4 divisors (see below), whose sum is σ = 91171410316. Its totient is φ = 78146923104.

The previous prime is 84659166701. The next prime is 84659166791. The reversal of 84659166709 is 90766195648.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49516040484 + 35143126225 = 222522^2 + 187465^2 .

It is a cyclic number.

It is not a de Polignac number, because 84659166709 - 2³ = 84659166701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84659166701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3256121784 + ... + 3256121809.

It is an arithmetic number, because the mean of its divisors is an integer number (22792852579).

Almost surely, 2^84659166709 is an apocalyptic number.

It is an amenable number.

84659166709 is a deficient number, since it is larger than the sum of its proper divisors (6512243607).

84659166709 is a wasteful number, since it uses less digits than its factorization.

84659166709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6512243606.

The product of its (nonzero) digits is 19595520, while the sum is 61.

The spelling of 84659166709 in words is "eighty-four billion, six hundred fifty-nine million, one hundred sixty-six thousand, seven hundred nine".