11531978684144 has 40 divisors (see below), whose sum is σ = 22905813704928. Its totient is φ = 5621017835520.

The previous prime is 11531978684101. The next prime is 11531978684159. The reversal of 11531978684144 is 44148687913511.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5926052 + ... + 7627715.

Almost surely, 2^{11531978684144} is an apocalyptic number.

It is an amenable number.

11531978684144 is a deficient number, since it is larger than the sum of its proper divisors (11373835020784).

11531978684144 is a wasteful number, since it uses less digits than its factorization.

11531978684144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13555113 (or 13555107 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 62.

The spelling of 11531978684144 in words is "eleven trillion, five hundred thirty-one billion, nine hundred seventy-eight million, six hundred eighty-four thousand, one hundred forty-four".