11565001166491 has 8 divisors (see below), whose sum is σ = 11744950616000. Its totient is φ = 11385890642880.

The previous prime is 11565001166443. The next prime is 11565001166513. The reversal of 11565001166491 is 19466110056511.

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

It is a cyclic number.

It is not a de Polignac number, because 11565001166491 - 2⁹ = 11565001165979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11565001166431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209703690 + ... + 209758831.

It is an arithmetic number, because the mean of its divisors is an integer number (1468118827000).

Almost surely, 2^{11565001166491} is an apocalyptic number.

11565001166491 is a deficient number, since it is larger than the sum of its proper divisors (179949449509).

11565001166491 is an equidigital number, since it uses as much as digits as its factorization.

11565001166491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419462949.

The product of its (nonzero) digits is 194400, while the sum is 46.

The spelling of 11565001166491 in words is "eleven trillion, five hundred sixty-five billion, one million, one hundred sixty-six thousand, four hundred ninety-one".