855515378859 has 4 divisors (see below), whose sum is σ = 1140687171816. Its totient is φ = 570343585904.

The previous prime is 855515378831. The next prime is 855515378863. The reversal of 855515378859 is 958873515558.

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 855515378859 - 2⁵ = 855515378827 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 855515378793 and 855515378802.

It is not an unprimeable number, because it can be changed into a prime (855515328859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142585896474 + ... + 142585896479.

It is an arithmetic number, because the mean of its divisors is an integer number (285171792954).

Almost surely, 2^855515378859 is an apocalyptic number.

855515378859 is a deficient number, since it is larger than the sum of its proper divisors (285171792957).

855515378859 is a wasteful number, since it uses less digits than its factorization.

855515378859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285171792956.

The product of its digits is 302400000, while the sum is 69.

The spelling of 855515378859 in words is "eight hundred fifty-five billion, five hundred fifteen million, three hundred seventy-eight thousand, eight hundred fifty-nine".