166428419947 has 2 divisors, whose sum is σ = 166428419948. Its totient is φ = 166428419946.

The previous prime is 166428419939. The next prime is 166428419987. The reversal of 166428419947 is 749914824661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166428419947 - 2³ = 166428419939 is a prime.

It is not a weakly prime, because it can be changed into another prime (166428419987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83214209973 + 83214209974.

It is an arithmetic number, because the mean of its divisors is an integer number (83214209974).

Almost surely, 2^166428419947 is an apocalyptic number.

166428419947 is a deficient number, since it is larger than the sum of its proper divisors (1).

166428419947 is an equidigital number, since it uses as much as digits as its factorization.

166428419947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20901888, while the sum is 61.

The spelling of 166428419947 in words is "one hundred sixty-six billion, four hundred twenty-eight million, four hundred nineteen thousand, nine hundred forty-seven".