1666768442 has 8 divisors (see below), whose sum is σ = 2501015616. Its totient is φ = 833096572.

The previous prime is 1666768429. The next prime is 1666768459. The reversal of 1666768442 is 2448676661.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136508 + ... + 148215.

It is an arithmetic number, because the mean of its divisors is an integer number (312626952).

Almost surely, 2^1666768442 is an apocalyptic number.

1666768442 is a deficient number, since it is larger than the sum of its proper divisors (834247174).

1666768442 is a wasteful number, since it uses less digits than its factorization.

1666768442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287652.

The product of its digits is 2322432, while the sum is 50.

The square root of 1666768442 is about 40826.0755155330. The cubic root of 1666768442 is about 1185.6552346056.

The spelling of 1666768442 in words is "one billion, six hundred sixty-six million, seven hundred sixty-eight thousand, four hundred forty-two".