661083443 has 2 divisors, whose sum is σ = 661083444. Its totient is φ = 661083442.

The previous prime is 661083389. The next prime is 661083517. The reversal of 661083443 is 344380166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661083443 - 2¹⁰ = 661082419 is a prime.

It is not a weakly prime, because it can be changed into another prime (661053443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330541721 + 330541722.

It is an arithmetic number, because the mean of its divisors is an integer number (330541722).

Almost surely, 2^661083443 is an apocalyptic number.

661083443 is a deficient number, since it is larger than the sum of its proper divisors (1).

661083443 is an equidigital number, since it uses as much as digits as its factorization.

661083443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 661083443 is about 25711.5429914270. The cubic root of 661083443 is about 871.1349274236.

The spelling of 661083443 in words is "six hundred sixty-one million, eighty-three thousand, four hundred forty-three".