166421159 has 2 divisors, whose sum is σ = 166421160. Its totient is φ = 166421158.

The previous prime is 166421149. The next prime is 166421179. The reversal of 166421159 is 951124661.

It is a weak prime.

It is an emirp because it is prime and its reverse (951124661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166421159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166421119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83210579 + 83210580.

It is an arithmetic number, because the mean of its divisors is an integer number (83210580).

Almost surely, 2^166421159 is an apocalyptic number.

166421159 is a deficient number, since it is larger than the sum of its proper divisors (1).

166421159 is an equidigital number, since it uses as much as digits as its factorization.

166421159 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 35.

The square root of 166421159 is about 12900.4325121292. The cubic root of 166421159 is about 550.0508592087.

The spelling of 166421159 in words is "one hundred sixty-six million, four hundred twenty-one thousand, one hundred fifty-nine".