11945664917 has 2 divisors, whose sum is σ = 11945664918. Its totient is φ = 11945664916.

The previous prime is 11945664893. The next prime is 11945664919. The reversal of 11945664917 is 71946654911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8126301316 + 3819363601 = 90146^2 + 61801^2 .

It is a cyclic number.

It is not a de Polignac number, because 11945664917 - 2⁶ = 11945664853 is a prime.

Together with 11945664919, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11945664919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5972832458 + 5972832459.

It is an arithmetic number, because the mean of its divisors is an integer number (5972832459).

Almost surely, 2^11945664917 is an apocalyptic number.

It is an amenable number.

11945664917 is a deficient number, since it is larger than the sum of its proper divisors (1).

11945664917 is an equidigital number, since it uses as much as digits as its factorization.

11945664917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 53.

The spelling of 11945664917 in words is "eleven billion, nine hundred forty-five million, six hundred sixty-four thousand, nine hundred seventeen".