166142197 has 4 divisors (see below), whose sum is σ = 178922380. Its totient is φ = 153362016.

The previous prime is 166142183. The next prime is 166142203. The reversal of 166142197 is 791241661.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23435281 + 142706916 = 4841^2 + 11946^2 .

It is a cyclic number.

It is not a de Polignac number, because 166142197 - 2⁷ = 166142069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166142167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6390072 + ... + 6390097.

It is an arithmetic number, because the mean of its divisors is an integer number (44730595).

Almost surely, 2^166142197 is an apocalyptic number.

It is an amenable number.

166142197 is a deficient number, since it is larger than the sum of its proper divisors (12780183).

166142197 is a wasteful number, since it uses less digits than its factorization.

166142197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12780182.

The product of its digits is 18144, while the sum is 37.

The square root of 166142197 is about 12889.6158592877. The cubic root of 166142197 is about 549.7433480232.

The spelling of 166142197 in words is "one hundred sixty-six million, one hundred forty-two thousand, one hundred ninety-seven".