166478639616 has 240 divisors, whose sum is σ = 510694367040. Its totient is φ = 52058972160.

The previous prime is 166478639609. The next prime is 166478639633. The reversal of 166478639616 is 616936874661.

166478639616 is a `hidden beast` number, since 1 + 6 + 6 + 4 + 7 + 8 + 6 + 3 + 9 + 616 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9008626 + ... + 9027086.

It is an arithmetic number, because the mean of its divisors is an integer number (2127893196).

Almost surely, 2^166478639616 is an apocalyptic number.

166478639616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166478639616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255347183520).

166478639616 is an abundant number, since it is smaller than the sum of its proper divisors (344215727424).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166478639616 is a wasteful number, since it uses less digits than its factorization.

166478639616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18607 (or 18588 counting only the distinct ones).

The product of its digits is 47029248, while the sum is 63.

The spelling of 166478639616 in words is "one hundred sixty-six billion, four hundred seventy-eight million, six hundred thirty-nine thousand, six hundred sixteen".