11561680026 has 24 divisors (see below), whose sum is σ = 26977253940. Its totient is φ = 3557439936.

The previous prime is 11561679971. The next prime is 11561680037. The reversal of 11561680026 is 62008616511.

11561680026 is a `hidden beast` number, since 1 + 15 + 616 + 8 + 0 + 0 + 26 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11449214001 + 112466025 = 107001^2 + 10605^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24704211 + ... + 24704678.

Almost surely, 2^11561680026 is an apocalyptic number.

11561680026 is an abundant number, since it is smaller than the sum of its proper divisors (15415573914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11561680026 is a wasteful number, since it uses less digits than its factorization.

11561680026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49408910 (or 49408907 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The spelling of 11561680026 in words is "eleven billion, five hundred sixty-one million, six hundred eighty thousand, twenty-six".