66542 has 16 divisors (see below), whose sum is σ = 117600. Its totient is φ = 28224.

The previous prime is 66541. The next prime is 66553. The reversal of 66542 is 24566.

Its product of digits (1440) is a multiple of the sum of its prime factors (120).

It is a plaindrome in base 9.

It is a nialpdrome in base 10.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 66542.

It is not an unprimeable number, because it can be changed into a prime (66541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 638 + ... + 734.

It is an arithmetic number, because the mean of its divisors is an integer number (7350).

2⁶⁶⁵⁴² is an apocalyptic number.

66542 is a deficient number, since it is larger than the sum of its proper divisors (51058).

66542 is an equidigital number, since it uses as much as digits as its factorization.

66542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120 (or 106 counting only the distinct ones).

The product of its digits is 1440, while the sum is 23.

The square root of 66542 is about 257.9573608176. The cubic root of 66542 is about 40.5227226044.

It can be divided in two parts, 665 and 42, that added together give a palindrome (707).

The spelling of 66542 in words is "sixty-six thousand, five hundred forty-two".