221457065347445 has 4 divisors (see below), whose sum is σ = 265748478416940. Its totient is φ = 177165652277952.

The previous prime is 221457065347327. The next prime is 221457065347543. The reversal of 221457065347445 is 544743560754122.

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 122929862215876 + 98527203131569 = 11087374^2 + 9926087^2 .

It is a cyclic number.

It is not a de Polignac number, because 221457065347445 - 2¹⁰ = 221457065346421 is a prime.

It is a super-3 number, since 3×221457065347445³ (a number of 44 digits) contains 333 as substring.

It is a congruent number.

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, 22145706534740 + ... + 22145706534749.

It is an arithmetic number, because the mean of its divisors is an integer number (66437119604235).

Almost surely, 2^{221457065347445} is an apocalyptic number.

It is an amenable number.

221457065347445 is a deficient number, since it is larger than the sum of its proper divisors (44291413069495).

221457065347445 is an equidigital number, since it uses as much as digits as its factorization.

221457065347445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44291413069494.

The product of its (nonzero) digits is 112896000, while the sum is 59.

The spelling of 221457065347445 in words is "two hundred twenty-one trillion, four hundred fifty-seven billion, sixty-five million, three hundred forty-seven thousand, four hundred forty-five".