78468667064855 has 4 divisors (see below), whose sum is σ = 94162400477832. Its totient is φ = 62774933651880.

The previous prime is 78468667064839. The next prime is 78468667064867. The reversal of 78468667064855 is 55846076686487.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 78468667064855 - 2⁴ = 78468667064839 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78468667064855.

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, 7846866706481 + ... + 7846866706490.

It is an arithmetic number, because the mean of its divisors is an integer number (23540600119458).

Almost surely, 2^{78468667064855} is an apocalyptic number.

78468667064855 is a deficient number, since it is larger than the sum of its proper divisors (15693733412977).

78468667064855 is a wasteful number, since it uses less digits than its factorization.

78468667064855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15693733412976.

The product of its (nonzero) digits is 13005619200, while the sum is 80.

The spelling of 78468667064855 in words is "seventy-eight trillion, four hundred sixty-eight billion, six hundred sixty-seven million, sixty-four thousand, eight hundred fifty-five".