11431261663 has 4 divisors (see below), whose sum is σ = 11495123640. Its totient is φ = 11367399688.

The previous prime is 11431261627. The next prime is 11431261693. The reversal of 11431261663 is 36616213411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36616213411 = 6163 ⋅5941297.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11431261663 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 (11431261613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31930720 + ... + 31931077.

It is an arithmetic number, because the mean of its divisors is an integer number (2873780910).

Almost surely, 2^11431261663 is an apocalyptic number.

11431261663 is a deficient number, since it is larger than the sum of its proper divisors (63861977).

11431261663 is an equidigital number, since it uses as much as digits as its factorization.

11431261663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63861976.

The product of its digits is 15552, while the sum is 34.

The spelling of 11431261663 in words is "eleven billion, four hundred thirty-one million, two hundred sixty-one thousand, six hundred sixty-three".