166020145 has 4 divisors (see below), whose sum is σ = 199224180. Its totient is φ = 132816112.

The previous prime is 166020103. The next prime is 166020161. The reversal of 166020145 is 541020661.

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 41563809 + 124456336 = 6447^2 + 11156^2 .

It is a cyclic number.

It is not a de Polignac number, because 166020145 - 2¹⁵ = 165987377 is a prime.

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, 16602010 + ... + 16602019.

It is an arithmetic number, because the mean of its divisors is an integer number (49806045).

Almost surely, 2^166020145 is an apocalyptic number.

It is an amenable number.

166020145 is a deficient number, since it is larger than the sum of its proper divisors (33204035).

166020145 is an equidigital number, since it uses as much as digits as its factorization.

166020145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33204034.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 166020145 is about 12884.8804806253. The cubic root of 166020145 is about 549.6086968760.

The spelling of 166020145 in words is "one hundred sixty-six million, twenty thousand, one hundred forty-five".