78564856261508 has 24 divisors (see below), whose sum is σ = 138799469655000. Its totient is φ = 38908122640128.

The previous prime is 78564856261487. The next prime is 78564856261517. The reversal of 78564856261508 is 80516265846587.

78564856261508 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 36933429434944 + 41631426826564 = 6077288^2 + 6452242^2 .

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 7 ways as a sum of consecutive naturals, for example, 30992633 + ... + 33431616.

It is an arithmetic number, because the mean of its divisors is an integer number (5783311235625).

Almost surely, 2^{78564856261508} is an apocalyptic number.

It is an amenable number.

78564856261508 is a deficient number, since it is larger than the sum of its proper divisors (60234613393492).

78564856261508 is a wasteful number, since it uses less digits than its factorization.

78564856261508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64427159 (or 64427157 counting only the distinct ones).

The product of its (nonzero) digits is 774144000, while the sum is 71.

The spelling of 78564856261508 in words is "seventy-eight trillion, five hundred sixty-four billion, eight hundred fifty-six million, two hundred sixty-one thousand, five hundred eight".