165636637 has 2 divisors, whose sum is σ = 165636638. Its totient is φ = 165636636.

The previous prime is 165636629. The next prime is 165636641. The reversal of 165636637 is 736636561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158608836 + 7027801 = 12594^2 + 2651^2 .

It is an emirp because it is prime and its reverse (736636561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165636637 - 2³ = 165636629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165636593 and 165636602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165636677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82818318 + 82818319.

It is an arithmetic number, because the mean of its divisors is an integer number (82818319).

Almost surely, 2^165636637 is an apocalyptic number.

It is an amenable number.

165636637 is a deficient number, since it is larger than the sum of its proper divisors (1).

165636637 is an equidigital number, since it uses as much as digits as its factorization.

165636637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 43.

The square root of 165636637 is about 12869.9897824357. The cubic root of 165636637 is about 549.1851702784.

The spelling of 165636637 in words is "one hundred sixty-five million, six hundred thirty-six thousand, six hundred thirty-seven".