865862225825 has 24 divisors (see below), whose sum is σ = 1089804232440. Its totient is φ = 682349696000.

The previous prime is 865862225797. The next prime is 865862225861. The reversal of 865862225825 is 528522268568.

It can be written as a sum of positive squares in 12 ways, for example, as 56214987409 + 809647238416 = 237097^2 + 899804^2 .

It is not a de Polignac number, because 865862225825 - 2²⁰ = 865861177249 is a prime.

It is a super-2 number, since 2×865862225825² (a number of 25 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (59) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 372920 + ... + 1367769.

It is an arithmetic number, because the mean of its divisors is an integer number (45408509685).

Almost surely, 2^865862225825 is an apocalyptic number.

It is an amenable number.

865862225825 is a deficient number, since it is larger than the sum of its proper divisors (223942006615).

865862225825 is a wasteful number, since it uses less digits than its factorization.

865862225825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1740997 (or 1740992 counting only the distinct ones).

The product of its digits is 36864000, while the sum is 59.

The spelling of 865862225825 in words is "eight hundred sixty-five billion, eight hundred sixty-two million, two hundred twenty-five thousand, eight hundred twenty-five".