165286661 has 2 divisors, whose sum is σ = 165286662. Its totient is φ = 165286660.

The previous prime is 165286657. The next prime is 165286669. The reversal of 165286661 is 166682561.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163686436 + 1600225 = 12794^2 + 1265^2 .

It is a cyclic number.

It is not a de Polignac number, because 165286661 - 2² = 165286657 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165286669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82643330 + 82643331.

It is an arithmetic number, because the mean of its divisors is an integer number (82643331).

Almost surely, 2^165286661 is an apocalyptic number.

It is an amenable number.

165286661 is a deficient number, since it is larger than the sum of its proper divisors (1).

165286661 is an equidigital number, since it uses as much as digits as its factorization.

165286661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 41.

The square root of 165286661 is about 12856.3860007391. The cubic root of 165286661 is about 548.7981038253.

The spelling of 165286661 in words is "one hundred sixty-five million, two hundred eighty-six thousand, six hundred sixty-one".