2166744660 has 24 divisors (see below), whose sum is σ = 6066885216. Its totient is φ = 577798560.

The previous prime is 2166744653. The next prime is 2166744661. The reversal of 2166744660 is 664476612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166744661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18056146 + ... + 18056265.

It is an arithmetic number, because the mean of its divisors is an integer number (252786884).

Almost surely, 2^2166744660 is an apocalyptic number.

2166744660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2166744660 is an abundant number, since it is smaller than the sum of its proper divisors (3900140556).

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

2166744660 is a wasteful number, since it uses less digits than its factorization.

2166744660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36112423 (or 36112421 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 42.

The square root of 2166744660 is about 46548.3045878150. The cubic root of 2166744660 is about 1294.0048724681.

The spelling of 2166744660 in words is "two billion, one hundred sixty-six million, seven hundred forty-four thousand, six hundred sixty".