166404663 has 6 divisors (see below), whose sum is σ = 240362304. Its totient is φ = 110936436.

The previous prime is 166404661. The next prime is 166404713. The reversal of 166404663 is 366404661.

166404663 is a `hidden beast` number, since 1 + 6 + 640 + 4 + 6 + 6 + 3 = 666.

It is not a de Polignac number, because 166404663 - 2¹ = 166404661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166404661) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9244695 + ... + 9244712.

It is an arithmetic number, because the mean of its divisors is an integer number (40060384).

Almost surely, 2^166404663 is an apocalyptic number.

166404663 is a deficient number, since it is larger than the sum of its proper divisors (73957641).

166404663 is a wasteful number, since it uses less digits than its factorization.

166404663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18489413 (or 18489410 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 166404663 is about 12899.7931378763. The cubic root of 166404663 is about 550.0326845590.

The spelling of 166404663 in words is "one hundred sixty-six million, four hundred four thousand, six hundred sixty-three".