165986437 has 2 divisors, whose sum is σ = 165986438. Its totient is φ = 165986436.

The previous prime is 165986371. The next prime is 165986441. The reversal of 165986437 is 734689561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147889921 + 18096516 = 12161^2 + 4254^2 .

It is a cyclic number.

It is not a de Polignac number, because 165986437 - 2¹¹ = 165984389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165986137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82993218 + 82993219.

It is an arithmetic number, because the mean of its divisors is an integer number (82993219).

Almost surely, 2^165986437 is an apocalyptic number.

It is an amenable number.

165986437 is a deficient number, since it is larger than the sum of its proper divisors (1).

165986437 is an equidigital number, since it uses as much as digits as its factorization.

165986437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 49.

The square root of 165986437 is about 12883.5723694944. The cubic root of 165986437 is about 549.5714976475.

The spelling of 165986437 in words is "one hundred sixty-five million, nine hundred eighty-six thousand, four hundred thirty-seven".