855317865 has 8 divisors (see below), whose sum is σ = 1368508608. Its totient is φ = 456169520.

The previous prime is 855317849. The next prime is 855317893. The reversal of 855317865 is 568713558.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 855317865 - 2⁴ = 855317849 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28510581 + ... + 28510610.

It is an arithmetic number, because the mean of its divisors is an integer number (171063576).

Almost surely, 2^855317865 is an apocalyptic number.

It is an amenable number.

855317865 is a deficient number, since it is larger than the sum of its proper divisors (513190743).

855317865 is a wasteful number, since it uses less digits than its factorization.

855317865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57021199.

The product of its digits is 1008000, while the sum is 48.

The square root of 855317865 is about 29245.8179061554. The cubic root of 855317865 is about 949.2396002021.

The spelling of 855317865 in words is "eight hundred fifty-five million, three hundred seventeen thousand, eight hundred sixty-five".