1306403666 has 8 divisors (see below), whose sum is σ = 1960075260. Its totient is φ = 653045248.

The previous prime is 1306403639. The next prime is 1306403711. The reversal of 1306403666 is 6663046031.

It can be written as a sum of positive squares in 2 ways, for example, as 1304726641 + 1677025 = 36121^2 + 1295^2 .

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, 67571 + ... + 84726.

Almost surely, 2^1306403666 is an apocalyptic number.

1306403666 is a deficient number, since it is larger than the sum of its proper divisors (653671594).

1306403666 is a wasteful number, since it uses less digits than its factorization.

1306403666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156588.

The product of its (nonzero) digits is 46656, while the sum is 35.

The square root of 1306403666 is about 36144.2065343811. The cubic root of 1306403666 is about 1093.1819782509.

Adding to 1306403666 its reverse (6663046031), we get a palindrome (7969449697).

The spelling of 1306403666 in words is "one billion, three hundred six million, four hundred three thousand, six hundred sixty-six".