66142 has 4 divisors (see below), whose sum is σ = 99216. Its totient is φ = 33070.

The previous prime is 66137. The next prime is 66161. The reversal of 66142 is 24166.

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

It is a congruent number.

It is an unprimeable number.

66142 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16534 + ... + 16537.

It is an arithmetic number, because the mean of its divisors is an integer number (24804).

2⁶⁶¹⁴² is an apocalyptic number.

66142 is a deficient number, since it is larger than the sum of its proper divisors (33074).

66142 is a wasteful number, since it uses less digits than its factorization.

66142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33073.

The product of its digits is 288, while the sum is 19.

The square root of 66142 is about 257.1808702062. The cubic root of 66142 is about 40.4413620760.

Adding to 66142 its product of digits (288), we get a triangular number (66430 = T₃₆₄).

It can be divided in two parts, 661 and 42, that added together give a triangular number (703 = T₃₇).

The spelling of 66142 in words is "sixty-six thousand, one hundred forty-two".