225064165561 has 8 divisors (see below), whose sum is σ = 227654870760. Its totient is φ = 222474835968.

The previous prime is 225064165559. The next prime is 225064165577. The reversal of 225064165561 is 165561460522.

It can be written as a sum of positive squares in 4 ways, for example, as 18726554025 + 206337611536 = 136845^2 + 454244^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 225064165561 - 2¹ = 225064165559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225064165541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12976 + ... + 671041.

It is an arithmetic number, because the mean of its divisors is an integer number (28456858845).

Almost surely, 2^225064165561 is an apocalyptic number.

It is an amenable number.

225064165561 is a deficient number, since it is larger than the sum of its proper divisors (2590705199).

225064165561 is an equidigital number, since it uses as much as digits as its factorization.

225064165561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687803.

The product of its (nonzero) digits is 432000, while the sum is 43.

It can be divided in two parts, 225064 and 165561, that added together give a 8-th power (390625 = 5⁸).

The spelling of 225064165561 in words is "two hundred twenty-five billion, sixty-four million, one hundred sixty-five thousand, five hundred sixty-one".