165638411 has 2 divisors, whose sum is σ = 165638412. Its totient is φ = 165638410.

The previous prime is 165638357. The next prime is 165638423. The reversal of 165638411 is 114836561.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165638411 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165638441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82819205 + 82819206.

It is an arithmetic number, because the mean of its divisors is an integer number (82819206).

Almost surely, 2^165638411 is an apocalyptic number.

165638411 is a deficient number, since it is larger than the sum of its proper divisors (1).

165638411 is an equidigital number, since it uses as much as digits as its factorization.

165638411 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 35.

The square root of 165638411 is about 12870.0587022748. The cubic root of 165638411 is about 549.1871308974.

The spelling of 165638411 in words is "one hundred sixty-five million, six hundred thirty-eight thousand, four hundred eleven".