1271438666 has 8 divisors (see below), whose sum is σ = 1990077984. Its totient is φ = 608079340.

The previous prime is 1271438647. The next prime is 1271438683. The reversal of 1271438666 is 6668341721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13819940 + ... + 13820031.

It is an arithmetic number, because the mean of its divisors is an integer number (248759748).

Almost surely, 2^1271438666 is an apocalyptic number.

1271438666 is a deficient number, since it is larger than the sum of its proper divisors (718639318).

1271438666 is a wasteful number, since it uses less digits than its factorization.

1271438666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27639996.

The product of its digits is 290304, while the sum is 44.

The square root of 1271438666 is about 35657.2386199492. The cubic root of 1271438666 is about 1083.3408965363.

The spelling of 1271438666 in words is "one billion, two hundred seventy-one million, four hundred thirty-eight thousand, six hundred sixty-six".