166204137 has 16 divisors (see below), whose sum is σ = 245066688. Its totient is φ = 99348480.

The previous prime is 166204127. The next prime is 166204139. The reversal of 166204137 is 731402661.

It is not a de Polignac number, because 166204137 - 2¹¹ = 166202089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166204139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32088 + ... + 36905.

It is an arithmetic number, because the mean of its divisors is an integer number (15316668).

Almost surely, 2^166204137 is an apocalyptic number.

It is an amenable number.

166204137 is a deficient number, since it is larger than the sum of its proper divisors (78862551).

166204137 is a wasteful number, since it uses less digits than its factorization.

166204137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69080.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 166204137 is about 12892.0183446968. The cubic root of 166204137 is about 549.8116567228.

Adding to 166204137 its reverse (731402661), we get a palindrome (897606798).

The spelling of 166204137 in words is "one hundred sixty-six million, two hundred four thousand, one hundred thirty-seven".