223638825661 has 4 divisors (see below), whose sum is σ = 226702371292. Its totient is φ = 220575280032.

The previous prime is 223638825659. The next prime is 223638825691. The reversal of 223638825661 is 166528836322.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45153700036 + 178485125625 = 212494^2 + 422475^2 .

It is a cyclic number.

It is not a de Polignac number, because 223638825661 - 2¹ = 223638825659 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 223638825599 and 223638825608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223638825601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1531772706 + ... + 1531772851.

It is an arithmetic number, because the mean of its divisors is an integer number (56675592823).

Almost surely, 2^223638825661 is an apocalyptic number.

It is an amenable number.

223638825661 is a deficient number, since it is larger than the sum of its proper divisors (3063545631).

223638825661 is an equidigital number, since it uses as much as digits as its factorization.

223638825661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3063545630.

The product of its digits is 4976640, while the sum is 52.

The spelling of 223638825661 in words is "two hundred twenty-three billion, six hundred thirty-eight million, eight hundred twenty-five thousand, six hundred sixty-one".