166478549 has 2 divisors, whose sum is σ = 166478550. Its totient is φ = 166478548.

The previous prime is 166478539. The next prime is 166478621. The reversal of 166478549 is 945874661.

166478549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132664324 + 33814225 = 11518^2 + 5815^2 .

It is a cyclic number.

It is not a de Polignac number, because 166478549 - 2⁸ = 166478293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166478497 and 166478506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166478539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83239274 + 83239275.

It is an arithmetic number, because the mean of its divisors is an integer number (83239275).

Almost surely, 2^166478549 is an apocalyptic number.

It is an amenable number.

166478549 is a deficient number, since it is larger than the sum of its proper divisors (1).

166478549 is an equidigital number, since it uses as much as digits as its factorization.

166478549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 50.

The square root of 166478549 is about 12902.6566644238. The cubic root of 166478549 is about 550.1140799174.

The spelling of 166478549 in words is "one hundred sixty-six million, four hundred seventy-eight thousand, five hundred forty-nine".