82709642647 has 4 divisors (see below), whose sum is σ = 85561699320. Its totient is φ = 79857585976.

The previous prime is 82709642633. The next prime is 82709642651. The reversal of 82709642647 is 74624690728.

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 82709642647 - 2¹¹ = 82709640599 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 (82709642947) 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, 1426028293 + ... + 1426028350.

It is an arithmetic number, because the mean of its divisors is an integer number (21390424830).

Almost surely, 2^82709642647 is an apocalyptic number.

82709642647 is a deficient number, since it is larger than the sum of its proper divisors (2852056673).

82709642647 is a wasteful number, since it uses less digits than its factorization.

82709642647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2852056672.

The product of its (nonzero) digits is 8128512, while the sum is 55.

The spelling of 82709642647 in words is "eighty-two billion, seven hundred nine million, six hundred forty-two thousand, six hundred forty-seven".