11663781953 has 2 divisors, whose sum is σ = 11663781954. Its totient is φ = 11663781952.

The previous prime is 11663781929. The next prime is 11663781971. The reversal of 11663781953 is 35918736611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9031271089 + 2632510864 = 95033^2 + 51308^2 .

It is a cyclic number.

It is not a de Polignac number, because 11663781953 - 2¹⁸ = 11663519809 is a prime.

It is not a weakly prime, because it can be changed into another prime (11663781053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5831890976 + 5831890977.

It is an arithmetic number, because the mean of its divisors is an integer number (5831890977).

Almost surely, 2^11663781953 is an apocalyptic number.

It is an amenable number.

11663781953 is a deficient number, since it is larger than the sum of its proper divisors (1).

11663781953 is an equidigital number, since it uses as much as digits as its factorization.

11663781953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 50.

The spelling of 11663781953 in words is "eleven billion, six hundred sixty-three million, seven hundred eighty-one thousand, nine hundred fifty-three".