1668942529 has 8 divisors (see below), whose sum is σ = 1678855680. Its totient is φ = 1659042000.

The previous prime is 1668942511. The next prime is 1668942533. The reversal of 1668942529 is 9252498661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1668942529 - 2²⁷ = 1534724801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1668942589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 431454 + ... + 435304.

It is an arithmetic number, because the mean of its divisors is an integer number (209856960).

Almost surely, 2^1668942529 is an apocalyptic number.

It is an amenable number.

1668942529 is a deficient number, since it is larger than the sum of its proper divisors (9913151).

1668942529 is a wasteful number, since it uses less digits than its factorization.

1668942529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6311.

The product of its digits is 1866240, while the sum is 52.

The square root of 1668942529 is about 40852.6930446452. The cubic root of 1668942529 is about 1186.1705226745.

The spelling of 1668942529 in words is "one billion, six hundred sixty-eight million, nine hundred forty-two thousand, five hundred twenty-nine".