165556453 has 2 divisors, whose sum is σ = 165556454. Its totient is φ = 165556452.

The previous prime is 165556441. The next prime is 165556477. The reversal of 165556453 is 354655561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128187684 + 37368769 = 11322^2 + 6113^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165556453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165556753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82778226 + 82778227.

It is an arithmetic number, because the mean of its divisors is an integer number (82778227).

Almost surely, 2^165556453 is an apocalyptic number.

It is an amenable number.

165556453 is a deficient number, since it is larger than the sum of its proper divisors (1).

165556453 is an equidigital number, since it uses as much as digits as its factorization.

165556453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270000, while the sum is 40.

The square root of 165556453 is about 12866.8742513479. The cubic root of 165556453 is about 549.0965365634.

The spelling of 165556453 in words is "one hundred sixty-five million, five hundred fifty-six thousand, four hundred fifty-three".