166867457 has 2 divisors, whose sum is σ = 166867458. Its totient is φ = 166867456.

The previous prime is 166867397. The next prime is 166867483. The reversal of 166867457 is 754768661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145347136 + 21520321 = 12056^2 + 4639^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166867457 is a prime.

It is not a weakly prime, because it can be changed into another prime (166867487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83433728 + 83433729.

It is an arithmetic number, because the mean of its divisors is an integer number (83433729).

Almost surely, 2^166867457 is an apocalyptic number.

It is an amenable number.

166867457 is a deficient number, since it is larger than the sum of its proper divisors (1).

166867457 is an equidigital number, since it uses as much as digits as its factorization.

166867457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1693440, while the sum is 50.

The square root of 166867457 is about 12917.7187227467. The cubic root of 166867457 is about 550.5421178174.

The spelling of 166867457 in words is "one hundred sixty-six million, eight hundred sixty-seven thousand, four hundred fifty-seven".