1668453539 has 2 divisors, whose sum is σ = 1668453540. Its totient is φ = 1668453538.

The previous prime is 1668453463. The next prime is 1668453547. The reversal of 1668453539 is 9353548661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1668453539 - 2¹² = 1668449443 is a prime.

It is not a weakly prime, because it can be changed into another prime (1668453439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834226769 + 834226770.

It is an arithmetic number, because the mean of its divisors is an integer number (834226770).

Almost surely, 2^1668453539 is an apocalyptic number.

1668453539 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668453539 is an equidigital number, since it uses as much as digits as its factorization.

1668453539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2332800, while the sum is 50.

The square root of 1668453539 is about 40846.7078110342. The cubic root of 1668453539 is about 1186.0546644447.

The spelling of 1668453539 in words is "one billion, six hundred sixty-eight million, four hundred fifty-three thousand, five hundred thirty-nine".