2166478080 has 144 divisors (see below), whose sum is σ = 7451606400. Its totient is φ = 533274624.

The previous prime is 2166478063. The next prime is 2166478091. The reversal of 2166478080 is 808746612.

It is a super-2 number, since 2×2166478080² = 9387254542240972800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28221 + ... + 71619.

Almost surely, 2^2166478080 is an apocalyptic number.

2166478080 is a gapful number since it is divisible by the number (20) 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 2166478080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3725803200).

2166478080 is an abundant number, since it is smaller than the sum of its proper divisors (5285128320).

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

2166478080 is a wasteful number, since it uses less digits than its factorization.

2166478080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43436 (or 43422 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 2166478080 is about 46545.4410227253. The cubic root of 2166478080 is about 1293.9518020759.

The spelling of 2166478080 in words is "two billion, one hundred sixty-six million, four hundred seventy-eight thousand, eighty".