221543766275165 has 8 divisors (see below), whose sum is σ = 275019847790040. Its totient is φ = 171123460846912.

The previous prime is 221543766275159. The next prime is 221543766275189. The reversal of 221543766275165 is 561572667345122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 12492131805241 + 209051634469924 = 3534421^2 + 14458618^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221543766275165 - 2²⁸ = 221543497839709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221543766275098 and 221543766275107.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 763944021494 + ... + 763944021783.

It is an arithmetic number, because the mean of its divisors is an integer number (34377480973755).

Almost surely, 2^{221543766275165} is an apocalyptic number.

It is an amenable number.

221543766275165 is a deficient number, since it is larger than the sum of its proper divisors (53476081514875).

221543766275165 is a wasteful number, since it uses less digits than its factorization.

221543766275165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1527888043311.

The product of its digits is 127008000, while the sum is 62.

The spelling of 221543766275165 in words is "two hundred twenty-one trillion, five hundred forty-three billion, seven hundred sixty-six million, two hundred seventy-five thousand, one hundred sixty-five".