16666142 has 4 divisors (see below), whose sum is σ = 24999216. Its totient is φ = 8333070.

The previous prime is 16666141. The next prime is 16666147. The reversal of 16666142 is 24166661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24166661 = 37 ⋅653153.

It is a junction number, because it is equal to n+sod(n) for n = 16666099 and 16666108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16666141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4166534 + ... + 4166537.

It is an arithmetic number, because the mean of its divisors is an integer number (6249804).

Almost surely, 2^16666142 is an apocalyptic number.

16666142 is a deficient number, since it is larger than the sum of its proper divisors (8333074).

16666142 is an equidigital number, since it uses as much as digits as its factorization.

16666142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8333073.

The product of its digits is 10368, while the sum is 32.

The square root of 16666142 is about 4082.4186458520. The cubic root of 16666142 is about 255.4337970563.

The spelling of 16666142 in words is "sixteen million, six hundred sixty-six thousand, one hundred forty-two".