82168165769 has 4 divisors (see below), whose sum is σ = 84388927044. Its totient is φ = 79947404496.

The previous prime is 82168165763. The next prime is 82168165777. The reversal of 82168165769 is 96756186128.

It is a happy number.

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 75205932169 + 6962233600 = 274237^2 + 83440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82168165769 is a prime.

It is a super-2 number, since 2×82168165769² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (82168165763) by changing a digit.

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, 1110380582 + ... + 1110380655.

It is an arithmetic number, because the mean of its divisors is an integer number (21097231761).

Almost surely, 2^82168165769 is an apocalyptic number.

It is an amenable number.

82168165769 is a deficient number, since it is larger than the sum of its proper divisors (2220761275).

82168165769 is a wasteful number, since it uses less digits than its factorization.

82168165769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2220761274.

The product of its digits is 8709120, while the sum is 59.

The spelling of 82168165769 in words is "eighty-two billion, one hundred sixty-eight million, one hundred sixty-five thousand, seven hundred sixty-nine".