82780549918 has 32 divisors (see below), whose sum is σ = 136075230720. Its totient is φ = 37456728960.

The previous prime is 82780549897. The next prime is 82780549979. The reversal of 82780549918 is 81994508728.

It is a congruent number.

It is an unprimeable number.

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, 4877355 + ... + 4894297.

It is an arithmetic number, because the mean of its divisors is an integer number (4252350960).

Almost surely, 2^82780549918 is an apocalyptic number.

82780549918 is a deficient number, since it is larger than the sum of its proper divisors (53294680802).

82780549918 is a wasteful number, since it uses less digits than its factorization.

82780549918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17952.

The product of its (nonzero) digits is 11612160, while the sum is 61.

The spelling of 82780549918 in words is "eighty-two billion, seven hundred eighty million, five hundred forty-nine thousand, nine hundred eighteen".