165535837 has 2 divisors, whose sum is σ = 165535838. Its totient is φ = 165535836.

The previous prime is 165535829. The next prime is 165535873. The reversal of 165535837 is 738535561.

Together with next prime (165535873) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144504441 + 21031396 = 12021^2 + 4586^2 .

It is a cyclic number.

It is not a de Polignac number, because 165535837 - 2³ = 165535829 is a prime.

It is a super-2 number, since 2×165535837² = 54804226662581138, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 165535793 and 165535802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165535537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82767918 + 82767919.

It is an arithmetic number, because the mean of its divisors is an integer number (82767919).

Almost surely, 2^165535837 is an apocalyptic number.

It is an amenable number.

165535837 is a deficient number, since it is larger than the sum of its proper divisors (1).

165535837 is an equidigital number, since it uses as much as digits as its factorization.

165535837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378000, while the sum is 43.

The square root of 165535837 is about 12866.0730994348. The cubic root of 165535837 is about 549.0737434437.

The spelling of 165535837 in words is "one hundred sixty-five million, five hundred thirty-five thousand, eight hundred thirty-seven".