443956661 has 2 divisors, whose sum is σ = 443956662. Its totient is φ = 443956660.

The previous prime is 443956633. The next prime is 443956663. The reversal of 443956661 is 166659344.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261436561 + 182520100 = 16169^2 + 13510^2 .

It is a cyclic number.

It is not a de Polignac number, because 443956661 - 2²⁶ = 376847797 is a prime.

It is a super-4 number, since 4×443956661⁴ (a number of 36 digits) contains 4444 as substring.

Together with 443956663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (443956663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221978330 + 221978331.

It is an arithmetic number, because the mean of its divisors is an integer number (221978331).

Almost surely, 2^443956661 is an apocalyptic number.

It is an amenable number.

443956661 is a deficient number, since it is larger than the sum of its proper divisors (1).

443956661 is an equidigital number, since it uses as much as digits as its factorization.

443956661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 44.

The square root of 443956661 is about 21070.2790916495. The cubic root of 443956661 is about 762.8635398416.

The spelling of 443956661 in words is "four hundred forty-three million, nine hundred fifty-six thousand, six hundred sixty-one".