11911861036550 has 24 divisors (see below), whose sum is σ = 22156170846600. Its totient is φ = 4764720905280.

The previous prime is 11911861036519. The next prime is 11911861036589. The reversal of 11911861036550 is 5563016811911.

It is a junction number, because it is equal to n+sod(n) for n = 11911861036495 and 11911861036504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12558881 + ... + 13474019.

It is an arithmetic number, because the mean of its divisors is an integer number (923173785275).

Almost surely, 2^{11911861036550} is an apocalyptic number.

11911861036550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11911861036550 is a deficient number, since it is larger than the sum of its proper divisors (10244309810050).

11911861036550 is a wasteful number, since it uses less digits than its factorization.

11911861036550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1175480 (or 1175475 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 47.

The spelling of 11911861036550 in words is "eleven trillion, nine hundred eleven billion, eight hundred sixty-one million, thirty-six thousand, five hundred fifty".