11381817663 has 6 divisors (see below), whose sum is σ = 16440403304. Its totient is φ = 7587878436.

The previous prime is 11381817583. The next prime is 11381817677. The reversal of 11381817663 is 36671818311.

11381817663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11381817663 - 2¹³ = 11381809471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11381817683) 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 in 5 ways as a sum of consecutive naturals, for example, 632323195 + ... + 632323212.

Almost surely, 2^11381817663 is an apocalyptic number.

11381817663 is a deficient number, since it is larger than the sum of its proper divisors (5058585641).

11381817663 is a wasteful number, since it uses less digits than its factorization.

11381817663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1264646413 (or 1264646410 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The spelling of 11381817663 in words is "eleven billion, three hundred eighty-one million, eight hundred seventeen thousand, six hundred sixty-three".