11995909997 has 2 divisors, whose sum is σ = 11995909998. Its totient is φ = 11995909996.

The previous prime is 11995909967. The next prime is 11995910021. The reversal of 11995909997 is 79990959911.

11995909997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7862191561 + 4133718436 = 88669^2 + 64294^2 .

It is a cyclic number.

It is not a de Polignac number, because 11995909997 - 2³² = 7700942701 is a prime.

It is a super-2 number, since 2×11995909997² (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 (11995909957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5997954998 + 5997954999.

It is an arithmetic number, because the mean of its divisors is an integer number (5997954999).

Almost surely, 2^11995909997 is an apocalyptic number.

It is an amenable number.

11995909997 is a deficient number, since it is larger than the sum of its proper divisors (1).

11995909997 is an equidigital number, since it uses as much as digits as its factorization.

11995909997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18600435, while the sum is 68.

The spelling of 11995909997 in words is "eleven billion, nine hundred ninety-five million, nine hundred nine thousand, nine hundred ninety-seven".