225253177621 has 4 divisors (see below), whose sum is σ = 225254306592. Its totient is φ = 225252048652.

The previous prime is 225253177577. The next prime is 225253177627. The reversal of 225253177621 is 126771352522.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 126771352522 = 2 ⋅63385676261.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225253177621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225253177627) 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 3 ways as a sum of consecutive naturals, for example, 176155 + ... + 693928.

It is an arithmetic number, because the mean of its divisors is an integer number (56313576648).

Almost surely, 2^225253177621 is an apocalyptic number.

It is an amenable number.

225253177621 is a deficient number, since it is larger than the sum of its proper divisors (1128971).

225253177621 is an equidigital number, since it uses as much as digits as its factorization.

225253177621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128970.

The product of its digits is 352800, while the sum is 43.

The spelling of 225253177621 in words is "two hundred twenty-five billion, two hundred fifty-three million, one hundred seventy-seven thousand, six hundred twenty-one".