855855765 has 12 divisors (see below), whose sum is σ = 1483483404. Its totient is φ = 456456384.

The previous prime is 855855761. The next prime is 855855887. The reversal of 855855765 is 567558558.

It is a happy number.

855855765 is a `hidden beast` number, since 8 + 5 + 585 + 57 + 6 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 163481796 + 692373969 = 12786^2 + 26313^2 .

It is not a de Polignac number, because 855855765 - 2² = 855855761 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855855761) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 9509464 + ... + 9509553.

It is an arithmetic number, because the mean of its divisors is an integer number (123623617).

Almost surely, 2^855855765 is an apocalyptic number.

It is an amenable number.

855855765 is a deficient number, since it is larger than the sum of its proper divisors (627627639).

855855765 is a wasteful number, since it uses less digits than its factorization.

855855765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19019028 (or 19019025 counting only the distinct ones).

The product of its digits is 8400000, while the sum is 54.

The square root of 855855765 is about 29255.0126474080. The cubic root of 855855765 is about 949.4385472849.

The spelling of 855855765 in words is "eight hundred fifty-five million, eight hundred fifty-five thousand, seven hundred sixty-five".