225821816684949 has 16 divisors (see below), whose sum is σ = 301558138749504. Its totient is φ = 150316861027200.

The previous prime is 225821816684921. The next prime is 225821816684977. The reversal of 225821816684949 is 949486618128522.

It is an interprime number because it is at equal distance from previous prime (225821816684921) and next prime (225821816684977).

It is not a de Polignac number, because 225821816684949 - 2²¹ = 225821814587797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225821816684749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16684222 + ... + 27018639.

It is an arithmetic number, because the mean of its divisors is an integer number (18847383671844).

Almost surely, 2^{225821816684949} is an apocalyptic number.

It is an amenable number.

225821816684949 is a deficient number, since it is larger than the sum of its proper divisors (75736322064555).

225821816684949 is a wasteful number, since it uses less digits than its factorization.

225821816684949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43705508.

The product of its digits is 955514880, while the sum is 75.

The spelling of 225821816684949 in words is "two hundred twenty-five trillion, eight hundred twenty-one billion, eight hundred sixteen million, six hundred eighty-four thousand, nine hundred forty-nine".