11945209669 has 2 divisors, whose sum is σ = 11945209670. Its totient is φ = 11945209668.

The previous prime is 11945209651. The next prime is 11945209673. The reversal of 11945209669 is 96690254911.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9229444900 + 2715764769 = 96070^2 + 52113^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11945209669 is a prime.

It is a super-2 number, since 2×11945209669² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11945209609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5972604834 + 5972604835.

It is an arithmetic number, because the mean of its divisors is an integer number (5972604835).

Almost surely, 2^11945209669 is an apocalyptic number.

It is an amenable number.

11945209669 is a deficient number, since it is larger than the sum of its proper divisors (1).

11945209669 is an equidigital number, since it uses as much as digits as its factorization.

11945209669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1049760, while the sum is 52.

The spelling of 11945209669 in words is "eleven billion, nine hundred forty-five million, two hundred nine thousand, six hundred sixty-nine".