78826665358580 has 12 divisors (see below), whose sum is σ = 165535997253060. Its totient is φ = 31530666143424.

The previous prime is 78826665358561. The next prime is 78826665358607. The reversal of 78826665358580 is 8585356662887.

It can be written as a sum of positive squares in 2 ways, for example, as 56140763085796 + 22685902272784 = 7492714^2 + 4762972^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1970666633945 + ... + 1970666633984.

It is an arithmetic number, because the mean of its divisors is an integer number (13794666437755).

Almost surely, 2^{78826665358580} is an apocalyptic number.

It is an amenable number.

78826665358580 is an abundant number, since it is smaller than the sum of its proper divisors (86709331894480).

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

78826665358580 is a wasteful number, since it uses less digits than its factorization.

78826665358580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3941333267938 (or 3941333267936 counting only the distinct ones).

The product of its (nonzero) digits is 4644864000, while the sum is 77.

The spelling of 78826665358580 in words is "seventy-eight trillion, eight hundred twenty-six billion, six hundred sixty-five million, three hundred fifty-eight thousand, five hundred eighty".