142442666 has 4 divisors (see below), whose sum is σ = 213664002. Its totient is φ = 71221332.

The previous prime is 142442647. The next prime is 142442681. The reversal of 142442666 is 666244241.

142442666 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 140541025 + 1901641 = 11855^2 + 1379^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35610665 + ... + 35610668.

Almost surely, 2^142442666 is an apocalyptic number.

142442666 is a deficient number, since it is larger than the sum of its proper divisors (71221336).

142442666 is an equidigital number, since it uses as much as digits as its factorization.

142442666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71221335.

The product of its digits is 55296, while the sum is 35.

The square root of 142442666 is about 11934.9346877140. The cubic root of 142442666 is about 522.2519030026.

The spelling of 142442666 in words is "one hundred forty-two million, four hundred forty-two thousand, six hundred sixty-six".