166478566 has 8 divisors (see below), whose sum is σ = 249807960. Its totient is φ = 83209248.

The previous prime is 166478549. The next prime is 166478621. The reversal of 166478566 is 665874661.

166478566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×166478566² = 55430225874832712, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7296 + ... + 19651.

It is an arithmetic number, because the mean of its divisors is an integer number (31225995).

Almost surely, 2^166478566 is an apocalyptic number.

166478566 is a deficient number, since it is larger than the sum of its proper divisors (83329394).

166478566 is a wasteful number, since it uses less digits than its factorization.

166478566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30038.

The product of its digits is 1451520, while the sum is 49.

The square root of 166478566 is about 12902.6573232028. The cubic root of 166478566 is about 550.1140986424.

The spelling of 166478566 in words is "one hundred sixty-six million, four hundred seventy-eight thousand, five hundred sixty-six".