83686678549 has 4 divisors (see below), whose sum is σ = 88609424364. Its totient is φ = 78763932736.

The previous prime is 83686678547. The next prime is 83686678553. The reversal of 83686678549 is 94587668638.

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 63619972900 + 20066705649 = 252230^2 + 141657^2 .

It is a cyclic number.

It is not a de Polignac number, because 83686678549 - 2¹ = 83686678547 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 (83686678547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2461372882 + ... + 2461372915.

It is an arithmetic number, because the mean of its divisors is an integer number (22152356091).

Almost surely, 2^83686678549 is an apocalyptic number.

It is an amenable number.

83686678549 is a deficient number, since it is larger than the sum of its proper divisors (4922745815).

83686678549 is a wasteful number, since it uses less digits than its factorization.

83686678549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4922745814.

The product of its digits is 418037760, while the sum is 70.

The spelling of 83686678549 in words is "eighty-three billion, six hundred eighty-six million, six hundred seventy-eight thousand, five hundred forty-nine".