165000881 has 2 divisors, whose sum is σ = 165000882. Its totient is φ = 165000880.

The previous prime is 165000859. The next prime is 165000887. The reversal of 165000881 is 188000561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155850256 + 9150625 = 12484^2 + 3025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165000881 is a prime.

It is a super-2 number, since 2×165000881² = 54450581461552322, which contains 22 as substring.

It is a Chen prime.

It is equal to p_9239024 and since 165000881 and 9239024 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (165000887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82500440 + 82500441.

It is an arithmetic number, because the mean of its divisors is an integer number (82500441).

Almost surely, 2^165000881 is an apocalyptic number.

It is an amenable number.

165000881 is a deficient number, since it is larger than the sum of its proper divisors (1).

165000881 is an equidigital number, since it uses as much as digits as its factorization.

165000881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 165000881 is about 12845.2668714978. The cubic root of 165000881 is about 548.4816314263.

The spelling of 165000881 in words is "one hundred sixty-five million, eight hundred eighty-one", and thus it is an aban number.