165138011 has 2 divisors, whose sum is σ = 165138012. Its totient is φ = 165138010.

The previous prime is 165137981. The next prime is 165138053. The reversal of 165138011 is 110831561.

It is a weak prime.

It is an emirp because it is prime and its reverse (110831561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165138011 is a prime.

It is a super-2 number, since 2×165138011² = 54541125354072242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165135011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82569005 + 82569006.

It is an arithmetic number, because the mean of its divisors is an integer number (82569006).

Almost surely, 2^165138011 is an apocalyptic number.

165138011 is a deficient number, since it is larger than the sum of its proper divisors (1).

165138011 is an equidigital number, since it uses as much as digits as its factorization.

165138011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 165138011 is about 12850.6035266831. The cubic root of 165138011 is about 548.6335345738.

Adding to 165138011 its reverse (110831561), we get a palindrome (275969572).

The spelling of 165138011 in words is "one hundred sixty-five million, one hundred thirty-eight thousand, eleven".