143131666 has 4 divisors (see below), whose sum is σ = 214697502. Its totient is φ = 71565832.

The previous prime is 143131643. The next prime is 143131679. The reversal of 143131666 is 666131341.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666131341 = 5479 ⋅121579.

It can be written as a sum of positive squares in only one way, i.e., 105493441 + 37638225 = 10271^2 + 6135^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35782915 + ... + 35782918.

Almost surely, 2^143131666 is an apocalyptic number.

143131666 is a deficient number, since it is larger than the sum of its proper divisors (71565836).

143131666 is an equidigital number, since it uses as much as digits as its factorization.

143131666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71565835.

The product of its digits is 7776, while the sum is 31.

The square root of 143131666 is about 11963.7647084854. The cubic root of 143131666 is about 523.0925990123.

The spelling of 143131666 in words is "one hundred forty-three million, one hundred thirty-one thousand, six hundred sixty-six".