1668454443 has 20 divisors (see below), whose sum is σ = 2638995480. Its totient is φ = 1046872512.

The previous prime is 1668454439. The next prime is 1668454507. The reversal of 1668454443 is 3444548661.

1668454443 is a `hidden beast` number, since 1 + 6 + 68 + 4 + 544 + 43 = 666.

It is not a de Polignac number, because 1668454443 - 2² = 1668454439 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1668454423) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 604453 + ... + 607206.

It is an arithmetic number, because the mean of its divisors is an integer number (131949774).

Almost surely, 2^1668454443 is an apocalyptic number.

1668454443 is a deficient number, since it is larger than the sum of its proper divisors (970541037).

1668454443 is a wasteful number, since it uses less digits than its factorization.

1668454443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211688 (or 1211679 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 45.

The square root of 1668454443 is about 40846.7188767960. The cubic root of 1668454443 is about 1186.0548786537.

The spelling of 1668454443 in words is "one billion, six hundred sixty-eight million, four hundred fifty-four thousand, four hundred forty-three".