11663394991 has 2 divisors, whose sum is σ = 11663394992. Its totient is φ = 11663394990.

The previous prime is 11663394971. The next prime is 11663395039. The reversal of 11663394991 is 19949336611.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11663394991 - 2¹⁵ = 11663362223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11663394961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5831697495 + 5831697496.

It is an arithmetic number, because the mean of its divisors is an integer number (5831697496).

Almost surely, 2^11663394991 is an apocalyptic number.

11663394991 is a deficient number, since it is larger than the sum of its proper divisors (1).

11663394991 is an equidigital number, since it uses as much as digits as its factorization.

11663394991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 944784, while the sum is 52.

The spelling of 11663394991 in words is "eleven billion, six hundred sixty-three million, three hundred ninety-four thousand, nine hundred ninety-one".