221573071577665 has 4 divisors (see below), whose sum is σ = 265887685893204. Its totient is φ = 177258457262128.

The previous prime is 221573071577621. The next prime is 221573071577849. The reversal of 221573071577665 is 566775170375122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 146936120001841 + 74636951575824 = 12121721^2 + 8639268^2 .

It is a cyclic number.

It is not a de Polignac number, because 221573071577665 - 2¹⁵ = 221573071544897 is a prime.

It is a super-2 number, since 2×221573071577665² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221573071577597 and 221573071577606.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22157307157762 + ... + 22157307157771.

It is an arithmetic number, because the mean of its divisors is an integer number (66471921473301).

Almost surely, 2^{221573071577665} is an apocalyptic number.

It is an amenable number.

221573071577665 is a deficient number, since it is larger than the sum of its proper divisors (44314614315539).

221573071577665 is an equidigital number, since it uses as much as digits as its factorization.

221573071577665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44314614315538.

The product of its (nonzero) digits is 129654000, while the sum is 64.

The spelling of 221573071577665 in words is "two hundred twenty-one trillion, five hundred seventy-three billion, seventy-one million, five hundred seventy-seven thousand, six hundred sixty-five".