165707143621 has 2 divisors, whose sum is σ = 165707143622. Its totient is φ = 165707143620.

The previous prime is 165707143607. The next prime is 165707143703. The reversal of 165707143621 is 126341707561.

165707143621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162055358721 + 3651784900 = 402561^2 + 60430^2 .

It is a cyclic number.

It is not a de Polignac number, because 165707143621 - 2¹⁹ = 165706619333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165707143421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82853571810 + 82853571811.

It is an arithmetic number, because the mean of its divisors is an integer number (82853571811).

Almost surely, 2^165707143621 is an apocalyptic number.

It is an amenable number.

165707143621 is a deficient number, since it is larger than the sum of its proper divisors (1).

165707143621 is an equidigital number, since it uses as much as digits as its factorization.

165707143621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211680, while the sum is 43.

The spelling of 165707143621 in words is "one hundred sixty-five billion, seven hundred seven million, one hundred forty-three thousand, six hundred twenty-one".