82780549917 has 16 divisors (see below), whose sum is σ = 118976258688. Its totient is φ = 50893928640.

The previous prime is 82780549897. The next prime is 82780549979. The reversal of 82780549917 is 71994508728.

It is not a de Polignac number, because 82780549917 - 2¹¹ = 82780547869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82780569917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 956934 + ... + 1039847.

It is an arithmetic number, because the mean of its divisors is an integer number (7436016168).

Almost surely, 2^82780549917 is an apocalyptic number.

It is an amenable number.

82780549917 is a deficient number, since it is larger than the sum of its proper divisors (36195708771).

82780549917 is a wasteful number, since it uses less digits than its factorization.

82780549917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997860.

The product of its (nonzero) digits is 10160640, while the sum is 60.

The spelling of 82780549917 in words is "eighty-two billion, seven hundred eighty million, five hundred forty-nine thousand, nine hundred seventeen".