82117309279 has 4 divisors (see below), whose sum is σ = 82132817184. Its totient is φ = 82101801376.

The previous prime is 82117309277. The next prime is 82117309283. The reversal of 82117309279 is 97290371128.

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

It is a cyclic number.

It is not a de Polignac number, because 82117309279 - 2¹ = 82117309277 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82117309273) 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, 7746007 + ... + 7756600.

It is an arithmetic number, because the mean of its divisors is an integer number (20533204296).

Almost surely, 2^82117309279 is an apocalyptic number.

82117309279 is a deficient number, since it is larger than the sum of its proper divisors (15507905).

82117309279 is a wasteful number, since it uses less digits than its factorization.

82117309279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15507904.

The product of its (nonzero) digits is 381024, while the sum is 49.

The spelling of 82117309279 in words is "eighty-two billion, one hundred seventeen million, three hundred nine thousand, two hundred seventy-nine".