166822553 has 2 divisors, whose sum is σ = 166822554. Its totient is φ = 166822552.

The previous prime is 166822549. The next prime is 166822561. The reversal of 166822553 is 355228661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96983104 + 69839449 = 9848^2 + 8357^2 .

It is a cyclic number.

It is not a de Polignac number, because 166822553 - 2² = 166822549 is a prime.

It is not a weakly prime, because it can be changed into another prime (160822553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83411276 + 83411277.

It is an arithmetic number, because the mean of its divisors is an integer number (83411277).

Almost surely, 2^166822553 is an apocalyptic number.

It is an amenable number.

166822553 is a deficient number, since it is larger than the sum of its proper divisors (1).

166822553 is an equidigital number, since it uses as much as digits as its factorization.

166822553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 38.

The square root of 166822553 is about 12915.9805280126. The cubic root of 166822553 is about 550.4927297950.

The spelling of 166822553 in words is "one hundred sixty-six million, eight hundred twenty-two thousand, five hundred fifty-three".