11965208989 has 2 divisors, whose sum is σ = 11965208990. Its totient is φ = 11965208988.

The previous prime is 11965208917. The next prime is 11965208993. The reversal of 11965208989 is 98980256911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7799539225 + 4165669764 = 88315^2 + 64542^2 .

It is a cyclic number.

It is not a de Polignac number, because 11965208989 - 2¹¹ = 11965206941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11965208089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5982604494 + 5982604495.

It is an arithmetic number, because the mean of its divisors is an integer number (5982604495).

Almost surely, 2^11965208989 is an apocalyptic number.

It is an amenable number.

11965208989 is a deficient number, since it is larger than the sum of its proper divisors (1).

11965208989 is an equidigital number, since it uses as much as digits as its factorization.

11965208989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2799360, while the sum is 58.

The spelling of 11965208989 in words is "eleven billion, nine hundred sixty-five million, two hundred eight thousand, nine hundred eighty-nine".