168666478 has 16 divisors (see below), whose sum is σ = 255016944. Its totient is φ = 83664000.

The previous prime is 168666467. The next prime is 168666499. The reversal of 168666478 is 874666861.

It is a happy number.

168666478 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168676 + ... + 169672.

It is an arithmetic number, because the mean of its divisors is an integer number (15938559).

Almost surely, 2^168666478 is an apocalyptic number.

168666478 is a deficient number, since it is larger than the sum of its proper divisors (86350466).

168666478 is a wasteful number, since it uses less digits than its factorization.

168666478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1587.

The product of its digits is 2322432, while the sum is 52.

The square root of 168666478 is about 12987.1658956063. The cubic root of 168666478 is about 552.5135400680.

The spelling of 168666478 in words is "one hundred sixty-eight million, six hundred sixty-six thousand, four hundred seventy-eight".