82505249569 has 4 divisors (see below), whose sum is σ = 82506443440. Its totient is φ = 82504055700.

The previous prime is 82505249521. The next prime is 82505249573. The reversal of 82505249569 is 96594250528.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82505249569 - 2⁷ = 82505249441 is a prime.

It is a super-2 number, since 2×82505249569² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82505249579) 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, 486459 + ... + 633760.

It is an arithmetic number, because the mean of its divisors is an integer number (20626610860).

Almost surely, 2^82505249569 is an apocalyptic number.

It is an amenable number.

82505249569 is a deficient number, since it is larger than the sum of its proper divisors (1193871).

82505249569 is a wasteful number, since it uses less digits than its factorization.

82505249569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1193870.

The product of its (nonzero) digits is 7776000, while the sum is 55.

The spelling of 82505249569 in words is "eighty-two billion, five hundred five million, two hundred forty-nine thousand, five hundred sixty-nine".