166203251 has 2 divisors, whose sum is σ = 166203252. Its totient is φ = 166203250.

The previous prime is 166203211. The next prime is 166203287. The reversal of 166203251 is 152302661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166203251 - 2¹⁸ = 165941107 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166203251.

It is not a weakly prime, because it can be changed into another prime (166203211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83101625 + 83101626.

It is an arithmetic number, because the mean of its divisors is an integer number (83101626).

Almost surely, 2^166203251 is an apocalyptic number.

166203251 is a deficient number, since it is larger than the sum of its proper divisors (1).

166203251 is an equidigital number, since it uses as much as digits as its factorization.

166203251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 166203251 is about 12891.9839823047. The cubic root of 166203251 is about 549.8106797435.

The spelling of 166203251 in words is "one hundred sixty-six million, two hundred three thousand, two hundred fifty-one".