166056511 has 2 divisors, whose sum is σ = 166056512. Its totient is φ = 166056510.

The previous prime is 166056509. The next prime is 166056521. The reversal of 166056511 is 115650661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166056511 - 2¹ = 166056509 is a prime.

Together with 166056509, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166056521) 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, 83028255 + 83028256.

It is an arithmetic number, because the mean of its divisors is an integer number (83028256).

Almost surely, 2^166056511 is an apocalyptic number.

166056511 is a deficient number, since it is larger than the sum of its proper divisors (1).

166056511 is an equidigital number, since it uses as much as digits as its factorization.

166056511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 166056511 is about 12886.2915922309. The cubic root of 166056511 is about 549.6488237548.

The spelling of 166056511 in words is "one hundred sixty-six million, fifty-six thousand, five hundred eleven".