166202665 has 4 divisors (see below), whose sum is σ = 199443204. Its totient is φ = 132962128.

The previous prime is 166202653. The next prime is 166202681. The reversal of 166202665 is 566202661.

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 54287424 + 111915241 = 7368^2 + 10579^2 .

It is a cyclic number.

It is not a de Polignac number, because 166202665 - 2⁷ = 166202537 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166202665.

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, 16620262 + ... + 16620271.

It is an arithmetic number, because the mean of its divisors is an integer number (49860801).

Almost surely, 2^166202665 is an apocalyptic number.

It is an amenable number.

166202665 is a deficient number, since it is larger than the sum of its proper divisors (33240539).

166202665 is an equidigital number, since it uses as much as digits as its factorization.

166202665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33240538.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 166202665 is about 12891.9612549837. The cubic root of 166202665 is about 549.8100335679.

The spelling of 166202665 in words is "one hundred sixty-six million, two hundred two thousand, six hundred sixty-five".