225166440023721 has 12 divisors (see below), whose sum is σ = 371703329563072. Its totient is φ = 128666537156376.

The previous prime is 225166440023699. The next prime is 225166440023741. The reversal of 225166440023721 is 127320044661522.

225166440023721 is a `hidden beast` number, since 2 + 2 + 5 + 1 + 6 + 6 + 4 + 400 + 237 + 2 + 1 = 666.

It is not a de Polignac number, because 225166440023721 - 2⁹ = 225166440023209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225166440023741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1787035238221 + ... + 1787035238346.

Almost surely, 2^{225166440023721} is an apocalyptic number.

225166440023721 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

225166440023721 is a deficient number, since it is larger than the sum of its proper divisors (146536889539351).

225166440023721 is a wasteful number, since it uses less digits than its factorization.

225166440023721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3574070476580 (or 3574070476577 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 45.

The spelling of 225166440023721 in words is "two hundred twenty-five trillion, one hundred sixty-six billion, four hundred forty million, twenty-three thousand, seven hundred twenty-one".