1662660443 has 2 divisors, whose sum is σ = 1662660444. Its totient is φ = 1662660442.

The previous prime is 1662660431. The next prime is 1662660457. The reversal of 1662660443 is 3440662661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1662660443 - 2⁸ = 1662660187 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1662660397 and 1662660406.

It is not a weakly prime, because it can be changed into another prime (1662660943) 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, 831330221 + 831330222.

It is an arithmetic number, because the mean of its divisors is an integer number (831330222).

Almost surely, 2^1662660443 is an apocalyptic number.

1662660443 is a deficient number, since it is larger than the sum of its proper divisors (1).

1662660443 is an equidigital number, since it uses as much as digits as its factorization.

1662660443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 38.

The square root of 1662660443 is about 40775.7335065845. The cubic root of 1662660443 is about 1184.6803586358.

The spelling of 1662660443 in words is "one billion, six hundred sixty-two million, six hundred sixty thousand, four hundred forty-three".