166500245 has 4 divisors (see below), whose sum is σ = 199800300. Its totient is φ = 133200192.

The previous prime is 166500203. The next prime is 166500253. The reversal of 166500245 is 542005661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 542005661 = 109 ⋅4972529.

It can be written as a sum of positive squares in 2 ways, for example, as 72352036 + 94148209 = 8506^2 + 9703^2 .

It is a cyclic number.

It is not a de Polignac number, because 166500245 - 2¹⁸ = 166238101 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16650020 + ... + 16650029.

It is an arithmetic number, because the mean of its divisors is an integer number (49950075).

Almost surely, 2^166500245 is an apocalyptic number.

It is an amenable number.

166500245 is a deficient number, since it is larger than the sum of its proper divisors (33300055).

166500245 is an equidigital number, since it uses as much as digits as its factorization.

166500245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33300054.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 166500245 is about 12903.4973941176. The cubic root of 166500245 is about 550.1379764028.

The spelling of 166500245 in words is "one hundred sixty-six million, five hundred thousand, two hundred forty-five".