225747045821 has 4 divisors (see below), whose sum is σ = 246269504544. Its totient is φ = 205224587100.

The previous prime is 225747045817. The next prime is 225747045859. The reversal of 225747045821 is 128540747522.

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.

It is a cyclic number.

It is not a de Polignac number, because 225747045821 - 2² = 225747045817 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 (225747047821) 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, 10261229345 + ... + 10261229366.

It is an arithmetic number, because the mean of its divisors is an integer number (61567376136).

Almost surely, 2^225747045821 is an apocalyptic number.

It is an amenable number.

225747045821 is a deficient number, since it is larger than the sum of its proper divisors (20522458723).

225747045821 is a wasteful number, since it uses less digits than its factorization.

225747045821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20522458722.

The product of its (nonzero) digits is 1254400, while the sum is 47.

The spelling of 225747045821 in words is "two hundred twenty-five billion, seven hundred forty-seven million, forty-five thousand, eight hundred twenty-one".