225788661 has 24 divisors (see below), whose sum is σ = 382637760. Its totient is φ = 128904048.

The previous prime is 225788653. The next prime is 225788699. The reversal of 225788661 is 166887522.

It is not a de Polignac number, because 225788661 - 2³ = 225788653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225788261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 206031 + ... + 207123.

It is an arithmetic number, because the mean of its divisors is an integer number (15943240).

Almost surely, 2^225788661 is an apocalyptic number.

225788661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

225788661 is a deficient number, since it is larger than the sum of its proper divisors (156849099).

225788661 is an frugal number, since it uses more digits than its factorization.

225788661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2202 (or 1103 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 225788661 is about 15026.2657037602. The cubic root of 225788661 is about 608.9300072439.

The spelling of 225788661 in words is "two hundred twenty-five million, seven hundred eighty-eight thousand, six hundred sixty-one".