221665776452226 has 24 divisors (see below), whose sum is σ = 480276292008240. Its totient is φ = 73888523992536.

The previous prime is 221665776452209. The next prime is 221665776452227. The reversal of 221665776452226 is 622254677566122.

It is a happy number.

221665776452226 is a `hidden beast` number, since 2 + 2 + 1 + 6 + 6 + 577 + 6 + 4 + 52 + 2 + 2 + 6 = 666.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (221665776452227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16774765 + ... + 26920703.

It is an arithmetic number, because the mean of its divisors is an integer number (20011512167010).

Almost surely, 2^{221665776452226} is an apocalyptic number.

221665776452226 is an abundant number, since it is smaller than the sum of its proper divisors (258610515556014).

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

221665776452226 is a wasteful number, since it uses less digits than its factorization.

221665776452226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11359710 (or 11359707 counting only the distinct ones).

The product of its digits is 203212800, while the sum is 63.

The spelling of 221665776452226 in words is "two hundred twenty-one trillion, six hundred sixty-five billion, seven hundred seventy-six million, four hundred fifty-two thousand, two hundred twenty-six".