166553071 has 2 divisors, whose sum is σ = 166553072. Its totient is φ = 166553070.

The previous prime is 166553039. The next prime is 166553099. The reversal of 166553071 is 170355661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166553071 - 2⁵ = 166553039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166553371) 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, 83276535 + 83276536.

It is an arithmetic number, because the mean of its divisors is an integer number (83276536).

Almost surely, 2^166553071 is an apocalyptic number.

166553071 is a deficient number, since it is larger than the sum of its proper divisors (1).

166553071 is an equidigital number, since it uses as much as digits as its factorization.

166553071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 166553071 is about 12905.5441961972. The cubic root of 166553071 is about 550.1961515240.

The spelling of 166553071 in words is "one hundred sixty-six million, five hundred fifty-three thousand, seventy-one".