1666838322 has 18 divisors (see below), whose sum is σ = 3611858367. Its totient is φ = 555555036.

The previous prime is 1666838293. The next prime is 1666838333. The reversal of 1666838322 is 2238386661.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 833419161 + 833419161 = 28869^2 + 28869^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=28869.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 168403 + ... + 178025.

Almost surely, 2^1666838322 is an apocalyptic number.

1666838322 is an abundant number, since it is smaller than the sum of its proper divisors (1945020045).

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

1666838322 is an frugal number, since it uses more digits than its factorization.

1666838322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19254 (or 9628 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The square root of 1666838322 is about 40826.9313321489. The cubic root of 1666838322 is about 1185.6718040797.

The spelling of 1666838322 in words is "one billion, six hundred sixty-six million, eight hundred thirty-eight thousand, three hundred twenty-two".