11111611663 has 2 divisors, whose sum is σ = 11111611664. Its totient is φ = 11111611662.

The previous prime is 11111611649. The next prime is 11111611669. The reversal of 11111611663 is 36611611111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11111611663 - 2²¹ = 11109514511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11111611669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555805831 + 5555805832.

It is an arithmetic number, because the mean of its divisors is an integer number (5555805832).

Almost surely, 2^11111611663 is an apocalyptic number.

11111611663 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111611663 is an equidigital number, since it uses as much as digits as its factorization.

11111611663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 28.

The spelling of 11111611663 in words is "eleven billion, one hundred eleven million, six hundred eleven thousand, six hundred sixty-three".