165709837 has 2 divisors, whose sum is σ = 165709838. Its totient is φ = 165709836.

The previous prime is 165709783. The next prime is 165709861. The reversal of 165709837 is 738907561.

Together with previous prime (165709783) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119006281 + 46703556 = 10909^2 + 6834^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165709837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165707837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82854918 + 82854919.

It is an arithmetic number, because the mean of its divisors is an integer number (82854919).

Almost surely, 2^165709837 is an apocalyptic number.

It is an amenable number.

165709837 is a deficient number, since it is larger than the sum of its proper divisors (1).

165709837 is an equidigital number, since it uses as much as digits as its factorization.

165709837 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 46.

The square root of 165709837 is about 12872.8332934129. The cubic root of 165709837 is about 549.2660590534.

The spelling of 165709837 in words is "one hundred sixty-five million, seven hundred nine thousand, eight hundred thirty-seven".