856745155 has 24 divisors (see below), whose sum is σ = 1212354432. Its totient is φ = 579422592.

The previous prime is 856745137. The next prime is 856745161. The reversal of 856745155 is 551547658.

It is not a de Polignac number, because 856745155 - 2¹⁹ = 856220867 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6067 + ... + 41836.

It is an arithmetic number, because the mean of its divisors is an integer number (50514768).

Almost surely, 2^856745155 is an apocalyptic number.

856745155 is a deficient number, since it is larger than the sum of its proper divisors (355609277).

856745155 is a wasteful number, since it uses less digits than its factorization.

856745155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47995 (or 47988 counting only the distinct ones).

The product of its digits is 840000, while the sum is 46.

The square root of 856745155 is about 29270.2093432896. The cubic root of 856745155 is about 949.7673132797.

The spelling of 856745155 in words is "eight hundred fifty-six million, seven hundred forty-five thousand, one hundred fifty-five".