65166161 has 4 divisors (see below), whose sum is σ = 67413300. Its totient is φ = 62919024.

The previous prime is 65166133. The next prime is 65166163. The reversal of 65166161 is 16166156.

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 18653761 + 46512400 = 4319^2 + 6820^2 .

It is a cyclic number.

It is not a de Polignac number, because 65166161 - 2¹⁸ = 64904017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65166163) 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, 1123526 + ... + 1123583.

It is an arithmetic number, because the mean of its divisors is an integer number (16853325).

Almost surely, 2^65166161 is an apocalyptic number.

It is an amenable number.

65166161 is a deficient number, since it is larger than the sum of its proper divisors (2247139).

65166161 is a wasteful number, since it uses less digits than its factorization.

65166161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2247138.

The product of its digits is 6480, while the sum is 32.

The square root of 65166161 is about 8072.5560388269. The cubic root of 65166161 is about 402.4148934677.

The spelling of 65166161 in words is "sixty-five million, one hundred sixty-six thousand, one hundred sixty-one".