11956533697 has 2 divisors, whose sum is σ = 11956533698. Its totient is φ = 11956533696.

The previous prime is 11956533679. The next prime is 11956533703. The reversal of 11956533697 is 79633565911.

Together with previous prime (11956533679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11710702656 + 245831041 = 108216^2 + 15679^2 .

It is an emirp because it is prime and its reverse (79633565911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11956533697 - 2¹⁵ = 11956500929 is a prime.

It is not a weakly prime, because it can be changed into another prime (11956533607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5978266848 + 5978266849.

It is an arithmetic number, because the mean of its divisors is an integer number (5978266849).

Almost surely, 2^11956533697 is an apocalyptic number.

It is an amenable number.

11956533697 is a deficient number, since it is larger than the sum of its proper divisors (1).

11956533697 is an equidigital number, since it uses as much as digits as its factorization.

11956533697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4592700, while the sum is 55.

The spelling of 11956533697 in words is "eleven billion, nine hundred fifty-six million, five hundred thirty-three thousand, six hundred ninety-seven".