2056688366557 has 24 divisors (see below), whose sum is σ = 2416876757568. Its totient is φ = 1742648392320.

The previous prime is 2056688366543. The next prime is 2056688366611. The reversal of 2056688366557 is 7556638866502.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-2056688366557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2056688366492 and 2056688366501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2056688366657) 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, 4641763 + ... + 5065504.

It is an arithmetic number, because the mean of its divisors is an integer number (100703198232).

Almost surely, 2^{2056688366557} is an apocalyptic number.

It is an amenable number.

2056688366557 is a deficient number, since it is larger than the sum of its proper divisors (360188391011).

2056688366557 is a wasteful number, since it uses less digits than its factorization.

2056688366557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9707409 (or 9707398 counting only the distinct ones).

The product of its (nonzero) digits is 435456000, while the sum is 67.

The spelling of 2056688366557 in words is "two trillion, fifty-six billion, six hundred eighty-eight million, three hundred sixty-six thousand, five hundred fifty-seven".