865225530625 has 45 divisors (see below), whose sum is σ = 1120627130623. Its totient is φ = 667791236000.

The previous prime is 865225530623. The next prime is 865225530649. The reversal of 865225530625 is 526035522568.

The square root of 865225530625 is 930175.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 647125322481 + 218100208144 = 804441^2 + 467012^2 .

It is not a de Polignac number, because 865225530625 - 2¹ = 865225530623 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (865225530623) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 674376234 + ... + 674377516.

Almost surely, 2^865225530625 is an apocalyptic number.

865225530625 is the 930175-th square number.

865225530625 is the 465088-th centered octagonal number.

It is an amenable number.

865225530625 is a deficient number, since it is larger than the sum of its proper divisors (255401599998).

865225530625 is an frugal number, since it uses more digits than its factorization.

865225530625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2644 (or 1317 counting only the distinct ones).

The product of its (nonzero) digits is 4320000, while the sum is 49.

Multiplying 865225530625 by its sum of digits (49), we get a square (42396051000625 = 6511225²).

The spelling of 865225530625 in words is "eight hundred sixty-five billion, two hundred twenty-five million, five hundred thirty thousand, six hundred twenty-five".