1338591666 has 16 divisors (see below), whose sum is σ = 2677771584. Its totient is φ = 446099184.

The previous prime is 1338591659. The next prime is 1338591671. The reversal of 1338591666 is 6661958331.

1338591666 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8491 + ... + 52433.

It is an arithmetic number, because the mean of its divisors is an integer number (167360724).

Almost surely, 2^1338591666 is an apocalyptic number.

1338591666 is an abundant number, since it is smaller than the sum of its proper divisors (1339179918).

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

1338591666 is a wasteful number, since it uses less digits than its factorization.

1338591666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49025.

The product of its digits is 699840, while the sum is 48.

The square root of 1338591666 is about 36586.7690019220. The cubic root of 1338591666 is about 1102.0874043956.

The spelling of 1338591666 in words is "one billion, three hundred thirty-eight million, five hundred ninety-one thousand, six hundred sixty-six".