11646381917 has 4 divisors (see below), whose sum is σ = 11649605436. Its totient is φ = 11643158400.

The previous prime is 11646381899. The next prime is 11646381931. The reversal of 11646381917 is 71918364611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71918364611 = 181 ⋅397339031.

It can be written as a sum of positive squares in 2 ways, for example, as 3829876996 + 7816504921 = 61886^2 + 88411^2 .

It is a cyclic number.

It is not a de Polignac number, because 11646381917 - 2⁶ = 11646381853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11646381517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1606334 + ... + 1613567.

It is an arithmetic number, because the mean of its divisors is an integer number (2912401359).

Almost surely, 2^11646381917 is an apocalyptic number.

It is an amenable number.

11646381917 is a deficient number, since it is larger than the sum of its proper divisors (3223519).

11646381917 is an equidigital number, since it uses as much as digits as its factorization.

11646381917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3223518.

The product of its digits is 217728, while the sum is 47.

The spelling of 11646381917 in words is "eleven billion, six hundred forty-six million, three hundred eighty-one thousand, nine hundred seventeen".