1668673819 has 2 divisors, whose sum is σ = 1668673820. Its totient is φ = 1668673818.

The previous prime is 1668673807. The next prime is 1668673843. The reversal of 1668673819 is 9183768661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1668673819 - 2²⁹ = 1131802907 is a prime.

It is a super-2 number, since 2×1668673819² = 5568944628432089522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1668673819.

It is not a weakly prime, because it can be changed into another prime (1668671819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834336909 + 834336910.

It is an arithmetic number, because the mean of its divisors is an integer number (834336910).

Almost surely, 2^1668673819 is an apocalyptic number.

1668673819 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668673819 is an equidigital number, since it uses as much as digits as its factorization.

1668673819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 55.

The square root of 1668673819 is about 40849.4041449811. The cubic root of 1668673819 is about 1186.1068590106.

The spelling of 1668673819 in words is "one billion, six hundred sixty-eight million, six hundred seventy-three thousand, eight hundred nineteen".