225656143217 has 4 divisors (see below), whose sum is σ = 225657474420. Its totient is φ = 225654812016.

The previous prime is 225656143201. The next prime is 225656143231. The reversal of 225656143217 is 712341656522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 712341656522 = 2 ⋅356170828261.

It can be written as a sum of positive squares in 2 ways, for example, as 121533115456 + 104123027761 = 348616^2 + 322681^2 .

It is a cyclic number.

It is not a de Polignac number, because 225656143217 - 2⁴ = 225656143201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225656143247) 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, 366542 + ... + 765287.

It is an arithmetic number, because the mean of its divisors is an integer number (56414368605).

Almost surely, 2^225656143217 is an apocalyptic number.

It is an amenable number.

225656143217 is a deficient number, since it is larger than the sum of its proper divisors (1331203).

225656143217 is a wasteful number, since it uses less digits than its factorization.

225656143217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331202.

The product of its digits is 604800, while the sum is 44.

Adding to 225656143217 its reverse (712341656522), we get a palindrome (937997799739).

The spelling of 225656143217 in words is "two hundred twenty-five billion, six hundred fifty-six million, one hundred forty-three thousand, two hundred seventeen".