166424441257 has 2 divisors, whose sum is σ = 166424441258. Its totient is φ = 166424441256.

The previous prime is 166424441213. The next prime is 166424441303. The reversal of 166424441257 is 752144424661.

It is an a-pointer prime, because the next prime (166424441303) can be obtained adding 166424441257 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100521336601 + 65903104656 = 317051^2 + 256716^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166424441257 is a prime.

It is not a weakly prime, because it can be changed into another prime (166424441207) 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, 83212220628 + 83212220629.

It is an arithmetic number, because the mean of its divisors is an integer number (83212220629).

Almost surely, 2^166424441257 is an apocalyptic number.

It is an amenable number.

166424441257 is a deficient number, since it is larger than the sum of its proper divisors (1).

166424441257 is an equidigital number, since it uses as much as digits as its factorization.

166424441257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1290240, while the sum is 46.

The spelling of 166424441257 in words is "one hundred sixty-six billion, four hundred twenty-four million, four hundred forty-one thousand, two hundred fifty-seven".