166426553 has 2 divisors, whose sum is σ = 166426554. Its totient is φ = 166426552.

The previous prime is 166426511. The next prime is 166426571. The reversal of 166426553 is 355624661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86359849 + 80066704 = 9293^2 + 8948^2 .

It is a cyclic number.

It is not a de Polignac number, because 166426553 - 2¹⁴ = 166410169 is a prime.

It is not a weakly prime, because it can be changed into another prime (166426573) 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, 83213276 + 83213277.

It is an arithmetic number, because the mean of its divisors is an integer number (83213277).

Almost surely, 2^166426553 is an apocalyptic number.

It is an amenable number.

166426553 is a deficient number, since it is larger than the sum of its proper divisors (1).

166426553 is an equidigital number, since it uses as much as digits as its factorization.

166426553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 38.

The square root of 166426553 is about 12900.6415731932. The cubic root of 166426553 is about 550.0568018470.

The spelling of 166426553 in words is "one hundred sixty-six million, four hundred twenty-six thousand, five hundred fifty-three".