83824721329 has 4 divisors (see below), whose sum is σ = 83913802740. Its totient is φ = 83735639920.

The previous prime is 83824721317. The next prime is 83824721353. The reversal of 83824721329 is 92312742838.

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 70976952225 + 12847769104 = 266415^2 + 113348^2 .

It is a cyclic number.

It is not a de Polignac number, because 83824721329 - 2¹⁷ = 83824590257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83824721429) 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, 44539294 + ... + 44541175.

It is an arithmetic number, because the mean of its divisors is an integer number (20978450685).

Almost surely, 2^83824721329 is an apocalyptic number.

It is an amenable number.

83824721329 is a deficient number, since it is larger than the sum of its proper divisors (89081411).

83824721329 is an equidigital number, since it uses as much as digits as its factorization.

83824721329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89081410.

The product of its digits is 1161216, while the sum is 49.

The spelling of 83824721329 in words is "eighty-three billion, eight hundred twenty-four million, seven hundred twenty-one thousand, three hundred twenty-nine".