1312640666 has 32 divisors (see below), whose sum is σ = 2049570432. Its totient is φ = 630051840.

The previous prime is 1312640653. The next prime is 1312640689. The reversal of 1312640666 is 6660462131.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1805195 + ... + 1805921.

It is an arithmetic number, because the mean of its divisors is an integer number (64049076).

Almost surely, 2^1312640666 is an apocalyptic number.

1312640666 is a deficient number, since it is larger than the sum of its proper divisors (736929766).

1312640666 is a wasteful number, since it uses less digits than its factorization.

1312640666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 1312640666 is about 36230.3831886995. The cubic root of 1312640666 is about 1094.9188978248.

The spelling of 1312640666 in words is "one billion, three hundred twelve million, six hundred forty thousand, six hundred sixty-six".