2056517641661 has 24 divisors (see below), whose sum is σ = 2501290872000. Its totient is φ = 1682709602112.

The previous prime is 2056517641649. The next prime is 2056517641667. The reversal of 2056517641661 is 1661467156502.

It is a de Polignac number, because none of the positive numbers 2^k-2056517641661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2056517641667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1266056 + ... + 2390801.

It is an arithmetic number, because the mean of its divisors is an integer number (104220453000).

Almost surely, 2^{2056517641661} is an apocalyptic number.

It is an amenable number.

2056517641661 is a deficient number, since it is larger than the sum of its proper divisors (444773230339).

2056517641661 is a wasteful number, since it uses less digits than its factorization.

2056517641661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3657393 (or 3657386 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 2056517641661 in words is "two trillion, fifty-six billion, five hundred seventeen million, six hundred forty-one thousand, six hundred sixty-one".