165650993 has 2 divisors, whose sum is σ = 165650994. Its totient is φ = 165650992.

The previous prime is 165650957. The next prime is 165651041. The reversal of 165650993 is 399056561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119858704 + 45792289 = 10948^2 + 6767^2 .

It is an emirp because it is prime and its reverse (399056561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165650993 - 2¹⁸ = 165388849 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (165650923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82825496 + 82825497.

It is an arithmetic number, because the mean of its divisors is an integer number (82825497).

Almost surely, 2^165650993 is an apocalyptic number.

It is an amenable number.

165650993 is a deficient number, since it is larger than the sum of its proper divisors (1).

165650993 is an equidigital number, since it uses as much as digits as its factorization.

165650993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 218700, while the sum is 44.

The square root of 165650993 is about 12870.5475019519. The cubic root of 165650993 is about 549.2010360810.

The spelling of 165650993 in words is "one hundred sixty-five million, six hundred fifty thousand, nine hundred ninety-three".