1668945939 has 8 divisors (see below), whose sum is σ = 2285403600. Its totient is φ = 1082559456.

The previous prime is 1668945931. The next prime is 1668945973. The reversal of 1668945939 is 9395498661.

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

It is not a de Polignac number, because 1668945939 - 2³ = 1668945931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1668945931) 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, 7517664 + ... + 7517885.

It is an arithmetic number, because the mean of its divisors is an integer number (285675450).

Almost surely, 2^1668945939 is an apocalyptic number.

1668945939 is a deficient number, since it is larger than the sum of its proper divisors (616457661).

1668945939 is a wasteful number, since it uses less digits than its factorization.

1668945939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15035589.

The product of its digits is 12597120, while the sum is 60.

The square root of 1668945939 is about 40852.7347799385. The cubic root of 1668945939 is about 1186.1713305391.

The spelling of 1668945939 in words is "one billion, six hundred sixty-eight million, nine hundred forty-five thousand, nine hundred thirty-nine".