166478047 has 2 divisors, whose sum is σ = 166478048. Its totient is φ = 166478046.

The previous prime is 166478023. The next prime is 166478051. The reversal of 166478047 is 740874661.

It is a strong prime.

It is an emirp because it is prime and its reverse (740874661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166478047 - 2¹¹ = 166475999 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166477994 and 166478012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166478017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83239023 + 83239024.

It is an arithmetic number, because the mean of its divisors is an integer number (83239024).

Almost surely, 2^166478047 is an apocalyptic number.

166478047 is a deficient number, since it is larger than the sum of its proper divisors (1).

166478047 is an equidigital number, since it uses as much as digits as its factorization.

166478047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 166478047 is about 12902.6372110511. The cubic root of 166478047 is about 550.1135269782.

The spelling of 166478047 in words is "one hundred sixty-six million, four hundred seventy-eight thousand, forty-seven".