165421158437 has 2 divisors, whose sum is σ = 165421158438. Its totient is φ = 165421158436.

The previous prime is 165421158377. The next prime is 165421158451. The reversal of 165421158437 is 734851124561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155071351681 + 10349806756 = 393791^2 + 101734^2 .

It is a cyclic number.

It is not a de Polignac number, because 165421158437 - 2³⁴ = 148241289253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165421158391 and 165421158400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165421158467) 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, 82710579218 + 82710579219.

It is an arithmetic number, because the mean of its divisors is an integer number (82710579219).

Almost surely, 2^165421158437 is an apocalyptic number.

It is an amenable number.

165421158437 is a deficient number, since it is larger than the sum of its proper divisors (1).

165421158437 is an equidigital number, since it uses as much as digits as its factorization.

165421158437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 806400, while the sum is 47.

The spelling of 165421158437 in words is "one hundred sixty-five billion, four hundred twenty-one million, one hundred fifty-eight thousand, four hundred thirty-seven".