166950865 has 4 divisors (see below), whose sum is σ = 200341044. Its totient is φ = 133560688.

The previous prime is 166950809. The next prime is 166950877. The reversal of 166950865 is 568059661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 568059661 = 13 ⋅43696897.

It can be written as a sum of positive squares in 2 ways, for example, as 71927361 + 95023504 = 8481^2 + 9748^2 .

It is a cyclic number.

It is not a de Polignac number, because 166950865 - 2¹³ = 166942673 is a prime.

It is a Duffinian 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, 16695082 + ... + 16695091.

It is an arithmetic number, because the mean of its divisors is an integer number (50085261).

Almost surely, 2^166950865 is an apocalyptic number.

It is an amenable number.

166950865 is a deficient number, since it is larger than the sum of its proper divisors (33390179).

166950865 is an equidigital number, since it uses as much as digits as its factorization.

166950865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33390178.

The product of its (nonzero) digits is 388800, while the sum is 46.

The square root of 166950865 is about 12920.9467532376. The cubic root of 166950865 is about 550.6338312628.

The spelling of 166950865 in words is "one hundred sixty-six million, nine hundred fifty thousand, eight hundred sixty-five".