1366664091 has 32 divisors (see below), whose sum is σ = 2075700480. Its totient is φ = 792892800.

The previous prime is 1366664087. The next prime is 1366664099. The reversal of 1366664091 is 1904666631.

It is not a de Polignac number, because 1366664091 - 2² = 1366664087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1366664099) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 151981 + ... + 160721.

It is an arithmetic number, because the mean of its divisors is an integer number (64865640).

Almost surely, 2^1366664091 is an apocalyptic number.

1366664091 is a deficient number, since it is larger than the sum of its proper divisors (709036389).

1366664091 is a wasteful number, since it uses less digits than its factorization.

1366664091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8987.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 1366664091 is about 36968.4201853420. The cubic root of 1366664091 is about 1109.7383499834.

The spelling of 1366664091 in words is "one billion, three hundred sixty-six million, six hundred sixty-four thousand, ninety-one".