78855455887 has 4 divisors (see below), whose sum is σ = 84921260200. Its totient is φ = 72789651576.

The previous prime is 78855455807. The next prime is 78855455891.

78855455887 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 78855455887 - 2²³ = 78847067279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78855455807) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3032902137 + ... + 3032902162.

It is an arithmetic number, because the mean of its divisors is an integer number (21230315050).

Almost surely, 2^78855455887 is an apocalyptic number.

78855455887 is a deficient number, since it is larger than the sum of its proper divisors (6065804313).

78855455887 is a wasteful number, since it uses less digits than its factorization.

78855455887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6065804312.

The product of its digits is 501760000, while the sum is 70.

The spelling of 78855455887 in words is "seventy-eight billion, eight hundred fifty-five million, four hundred fifty-five thousand, eight hundred eighty-seven".