866308855 has 4 divisors (see below), whose sum is σ = 1039570632. Its totient is φ = 693047080.

The previous prime is 866308853. The next prime is 866308873. The reversal of 866308855 is 558803668.

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

It is not a de Polignac number, because 866308855 - 2¹ = 866308853 is a prime.

It is a super-2 number, since 2×866308855² = 1500982064502822050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 866308799 and 866308808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866308853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86630881 + ... + 86630890.

It is an arithmetic number, because the mean of its divisors is an integer number (259892658).

Almost surely, 2^866308855 is an apocalyptic number.

866308855 is a deficient number, since it is larger than the sum of its proper divisors (173261777).

866308855 is a wasteful number, since it uses less digits than its factorization.

866308855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173261776.

The product of its (nonzero) digits is 1382400, while the sum is 49.

The square root of 866308855 is about 29433.1251313890. The cubic root of 866308855 is about 953.2882744636.

The spelling of 866308855 in words is "eight hundred sixty-six million, three hundred eight thousand, eight hundred fifty-five".