11555440263 has 16 divisors (see below), whose sum is σ = 17182821600. Its totient is φ = 7674984000.

The previous prime is 11555440249. The next prime is 11555440279. The reversal of 11555440263 is 36204455511.

11555440263 is a `hidden beast` number, since 1 + 1 + 5 + 554 + 40 + 2 + 63 = 666.

It is not a de Polignac number, because 11555440263 - 2¹³ = 11555432071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11555440213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 788238 + ... + 802763.

It is an arithmetic number, because the mean of its divisors is an integer number (1073926350).

Almost surely, 2^11555440263 is an apocalyptic number.

11555440263 is a deficient number, since it is larger than the sum of its proper divisors (5627381337).

11555440263 is a wasteful number, since it uses less digits than its factorization.

11555440263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591279 (or 1591273 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

Adding to 11555440263 its reverse (36204455511), we get a palindrome (47759895774).

The spelling of 11555440263 in words is "eleven billion, five hundred fifty-five million, four hundred forty thousand, two hundred sixty-three".