11561056399156 has 24 divisors (see below), whose sum is σ = 22071196556640. Its totient is φ = 5255004472800.

The previous prime is 11561056399049. The next prime is 11561056399181. The reversal of 11561056399156 is 65199365016511.

It is a self number, because there is not a number n which added to its sum of digits gives 11561056399156.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17183211 + ... + 17843341.

It is an arithmetic number, because the mean of its divisors is an integer number (919633189860).

Almost surely, 2^{11561056399156} is an apocalyptic number.

It is an amenable number.

11561056399156 is a deficient number, since it is larger than the sum of its proper divisors (10510140157484).

11561056399156 is a wasteful number, since it uses less digits than its factorization.

11561056399156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058175 (or 1058173 counting only the distinct ones).

The product of its (nonzero) digits is 6561000, while the sum is 58.

The spelling of 11561056399156 in words is "eleven trillion, five hundred sixty-one billion, fifty-six million, three hundred ninety-nine thousand, one hundred fifty-six".