11556660322431 has 48 divisors (see below), whose sum is σ = 19253419361280. Its totient is φ = 6543008720640.

The previous prime is 11556660322421. The next prime is 11556660322447. The reversal of 11556660322431 is 13422306665511.

It is a happy number.

It is not a de Polignac number, because 11556660322431 - 2¹⁰ = 11556660321407 is a prime.

It is a super-2 number, since 2×11556660322431² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11556660322421) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19578310 + ... + 20159948.

It is an arithmetic number, because the mean of its divisors is an integer number (401112903360).

Almost surely, 2^{11556660322431} is an apocalyptic number.

11556660322431 is a deficient number, since it is larger than the sum of its proper divisors (7696759038849).

11556660322431 is a wasteful number, since it uses less digits than its factorization.

11556660322431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584556 (or 584553 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

Adding to 11556660322431 its reverse (13422306665511), we get a palindrome (24978966987942).

The spelling of 11556660322431 in words is "eleven trillion, five hundred fifty-six billion, six hundred sixty million, three hundred twenty-two thousand, four hundred thirty-one".