166542101 has 12 divisors (see below), whose sum is σ = 185799936. Its totient is φ = 149134920.

The previous prime is 166542097. The next prime is 166542119. The reversal of 166542101 is 101245661.

It is not a de Polignac number, because 166542101 - 2² = 166542097 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166542121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2165 + ... + 18378.

It is an arithmetic number, because the mean of its divisors is an integer number (15483328).

Almost surely, 2^166542101 is an apocalyptic number.

166542101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166542101 is a deficient number, since it is larger than the sum of its proper divisors (19257835).

166542101 is a wasteful number, since it uses less digits than its factorization.

166542101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20632 (or 20621 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 166542101 is about 12905.1191780626. The cubic root of 166542101 is about 550.1840717221.

Adding to 166542101 its reverse (101245661), we get a palindrome (267787762).

The spelling of 166542101 in words is "one hundred sixty-six million, five hundred forty-two thousand, one hundred one".