855515378863 has 2 divisors, whose sum is σ = 855515378864. Its totient is φ = 855515378862.

The previous prime is 855515378831. The next prime is 855515378891. The reversal of 855515378863 is 368873515558.

855515378863 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 855515378863 - 2⁵ = 855515378831 is a prime.

It is a super-2 number, since 2×855515378863² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 855515378795 and 855515378804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855515378803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427757689431 + 427757689432.

It is an arithmetic number, because the mean of its divisors is an integer number (427757689432).

Almost surely, 2^855515378863 is an apocalyptic number.

855515378863 is a deficient number, since it is larger than the sum of its proper divisors (1).

855515378863 is an equidigital number, since it uses as much as digits as its factorization.

855515378863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960000, while the sum is 64.

The spelling of 855515378863 in words is "eight hundred fifty-five billion, five hundred fifteen million, three hundred seventy-eight thousand, eight hundred sixty-three".