1666661342 has 8 divisors (see below), whose sum is σ = 2631570600. Its totient is φ = 789471144.

The previous prime is 1666661333. The next prime is 1666661371. The reversal of 1666661342 is 2431666661.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1666661342.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21929717 + ... + 21929792.

It is an arithmetic number, because the mean of its divisors is an integer number (328946325).

Almost surely, 2^1666661342 is an apocalyptic number.

1666661342 is a deficient number, since it is larger than the sum of its proper divisors (964909258).

1666661342 is a wasteful number, since it uses less digits than its factorization.

1666661342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43859530.

The product of its digits is 186624, while the sum is 41.

The square root of 1666661342 is about 40824.7638327523. The cubic root of 1666661342 is about 1185.6298388773.

The spelling of 1666661342 in words is "one billion, six hundred sixty-six million, six hundred sixty-one thousand, three hundred forty-two".