225663918 has 16 divisors (see below), whose sum is σ = 462336336. Its totient is φ = 73386560.

The previous prime is 225663901. The next prime is 225663929. The reversal of 225663918 is 819366522.

It is a super-2 number, since 2×225663918² = 101848407774221448, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 225663918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 458421 + ... + 458912.

It is an arithmetic number, because the mean of its divisors is an integer number (28896021).

Almost surely, 2^225663918 is an apocalyptic number.

225663918 is an abundant number, since it is smaller than the sum of its proper divisors (236672418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

225663918 is a wasteful number, since it uses less digits than its factorization.

225663918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917379.

The product of its digits is 155520, while the sum is 42.

The square root of 225663918 is about 15022.1142985933. The cubic root of 225663918 is about 608.8178466826.

The spelling of 225663918 in words is "two hundred twenty-five million, six hundred sixty-three thousand, nine hundred eighteen".