2166606440 has 64 divisors (see below), whose sum is σ = 5093884800. Its totient is φ = 827811072.

The previous prime is 2166606439. The next prime is 2166606457. The reversal of 2166606440 is 446066612.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 2166606440.

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, 982379 + ... + 984581.

It is an arithmetic number, because the mean of its divisors is an integer number (79591950).

Almost surely, 2^2166606440 is an apocalyptic number.

2166606440 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 2166606440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2546942400).

2166606440 is an abundant number, since it is smaller than the sum of its proper divisors (2927278360).

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

2166606440 is a wasteful number, since it uses less digits than its factorization.

2166606440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3306 (or 3302 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 2166606440 is about 46546.8198698901. The cubic root of 2166606440 is about 1293.9773563575.

The spelling of 2166606440 in words is "two billion, one hundred sixty-six million, six hundred six thousand, four hundred forty".