165716340437 has 2 divisors, whose sum is σ = 165716340438. Its totient is φ = 165716340436.

The previous prime is 165716340421. The next prime is 165716340467. The reversal of 165716340437 is 734043617561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137111721796 + 28604618641 = 370286^2 + 169129^2 .

It is an emirp because it is prime and its reverse (734043617561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165716340437 - 2⁴ = 165716340421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165716340391 and 165716340400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165716340467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82858170218 + 82858170219.

It is an arithmetic number, because the mean of its divisors is an integer number (82858170219).

Almost surely, 2^165716340437 is an apocalyptic number.

It is an amenable number.

165716340437 is a deficient number, since it is larger than the sum of its proper divisors (1).

165716340437 is an equidigital number, since it uses as much as digits as its factorization.

165716340437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1270080, while the sum is 47.

Adding to 165716340437 its reverse (734043617561), we get a palindrome (899759957998).

The spelling of 165716340437 in words is "one hundred sixty-five billion, seven hundred sixteen million, three hundred forty thousand, four hundred thirty-seven".