11663394961 has 2 divisors, whose sum is σ = 11663394962. Its totient is φ = 11663394960.

The previous prime is 11663394947. The next prime is 11663394971. The reversal of 11663394961 is 16949336611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10379534400 + 1283860561 = 101880^2 + 35831^2 .

It is a cyclic number.

It is not a de Polignac number, because 11663394961 - 2¹¹ = 11663392913 is a prime.

It is not a weakly prime, because it can be changed into another prime (11663394971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5831697480 + 5831697481.

It is an arithmetic number, because the mean of its divisors is an integer number (5831697481).

Almost surely, 2^11663394961 is an apocalyptic number.

It is an amenable number.

11663394961 is a deficient number, since it is larger than the sum of its proper divisors (1).

11663394961 is an equidigital number, since it uses as much as digits as its factorization.

11663394961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 49.

The spelling of 11663394961 in words is "eleven billion, six hundred sixty-three million, three hundred ninety-four thousand, nine hundred sixty-one".