82077825565 has 4 divisors (see below), whose sum is σ = 98493390684. Its totient is φ = 65662260448.

The previous prime is 82077825541. The next prime is 82077825593. The reversal of 82077825565 is 56552877028.

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 38261707236 + 43816118329 = 195606^2 + 209323^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82077825565 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 8207782552 + ... + 8207782561.

It is an arithmetic number, because the mean of its divisors is an integer number (24623347671).

Almost surely, 2^82077825565 is an apocalyptic number.

It is an amenable number.

82077825565 is a deficient number, since it is larger than the sum of its proper divisors (16415565119).

82077825565 is a wasteful number, since it uses less digits than its factorization.

82077825565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16415565118.

The product of its (nonzero) digits is 9408000, while the sum is 55.

The spelling of 82077825565 in words is "eighty-two billion, seventy-seven million, eight hundred twenty-five thousand, five hundred sixty-five".