2116661432656 has 20 divisors (see below), whose sum is σ = 4242446406900. Its totient is φ = 1021836553472.

The previous prime is 2116661432647. The next prime is 2116661432687. The reversal of 2116661432656 is 6562341666112.

It can be written as a sum of positive squares in 2 ways, for example, as 1611731811600 + 504929621056 = 1269540^2 + 710584^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2280884701 + ... + 2280885628.

It is an arithmetic number, because the mean of its divisors is an integer number (212122320345).

Almost surely, 2^{2116661432656} is an apocalyptic number.

It is an amenable number.

2116661432656 is an abundant number, since it is smaller than the sum of its proper divisors (2125784974244).

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

2116661432656 is a wasteful number, since it uses less digits than its factorization.

2116661432656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4561770366 (or 4561770360 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 49.

The spelling of 2116661432656 in words is "two trillion, one hundred sixteen billion, six hundred sixty-one million, four hundred thirty-two thousand, six hundred fifty-six".