865852065 has 48 divisors (see below), whose sum is σ = 1666851840. Its totient is φ = 426254400.

The previous prime is 865852061. The next prime is 865852121. The reversal of 865852065 is 560258568.

865852065 is a `hidden beast` number, since 8 + 6 + 585 + 2 + 0 + 65 = 666.

It is not a de Polignac number, because 865852065 - 2² = 865852061 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 865852065.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865852061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3840 + ... + 41790.

It is an arithmetic number, because the mean of its divisors is an integer number (34726080).

Almost surely, 2^865852065 is an apocalyptic number.

It is an amenable number.

865852065 is a deficient number, since it is larger than the sum of its proper divisors (800999775).

865852065 is a wasteful number, since it uses less digits than its factorization.

865852065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37991 (or 37972 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 45.

The square root of 865852065 is about 29425.3643138025. The cubic root of 865852065 is about 953.1206940807.

The spelling of 865852065 in words is "eight hundred sixty-five million, eight hundred fifty-two thousand, sixty-five".