78558241866 has 16 divisors (see below), whose sum is σ = 169202367264. Its totient is φ = 24171766704.

The previous prime is 78558241841. The next prime is 78558241889. The reversal of 78558241866 is 66814285587.

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 7 ways as a sum of consecutive naturals, for example, 503578396 + ... + 503578551.

It is an arithmetic number, because the mean of its divisors is an integer number (10575147954).

Almost surely, 2^78558241866 is an apocalyptic number.

78558241866 is an abundant number, since it is smaller than the sum of its proper divisors (90644125398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78558241866 is a wasteful number, since it uses less digits than its factorization.

78558241866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007156965.

The product of its digits is 25804800, while the sum is 60.

The spelling of 78558241866 in words is "seventy-eight billion, five hundred fifty-eight million, two hundred forty-one thousand, eight hundred sixty-six".