82709421329 has 4 divisors (see below), whose sum is σ = 82710002484. Its totient is φ = 82708840176.

The previous prime is 82709421271. The next prime is 82709421371. The reversal of 82709421329 is 92312490728.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 40664739025 + 42044682304 = 201655^2 + 205048^2 .

It is a cyclic number.

It is not a de Polignac number, because 82709421329 - 2³⁶ = 13989944593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82709121329) 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, 82979 + ... + 415095.

It is an arithmetic number, because the mean of its divisors is an integer number (20677500621).

Almost surely, 2^82709421329 is an apocalyptic number.

It is an amenable number.

82709421329 is a deficient number, since it is larger than the sum of its proper divisors (581155).

82709421329 is a wasteful number, since it uses less digits than its factorization.

82709421329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581154.

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 82709421329 in words is "eighty-two billion, seven hundred nine million, four hundred twenty-one thousand, three hundred twenty-nine".