2056556557 has 16 divisors (see below), whose sum is σ = 2262758400. Its totient is φ = 1853611200.

The previous prime is 2056556543. The next prime is 2056556563. The reversal of 2056556557 is 7556556502.

It is a cyclic number.

It is not a de Polignac number, because 2056556557 - 2¹⁵ = 2056523789 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 (2056556507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1397332 + ... + 1398802.

It is an arithmetic number, because the mean of its divisors is an integer number (141422400).

Almost surely, 2^2056556557 is an apocalyptic number.

It is an amenable number.

2056556557 is a deficient number, since it is larger than the sum of its proper divisors (206201843).

2056556557 is a wasteful number, since it uses less digits than its factorization.

2056556557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2484.

The product of its (nonzero) digits is 1575000, while the sum is 46.

The square root of 2056556557 is about 45349.2729489680. The cubic root of 2056556557 is about 1271.6869633431.

Subtracting 2056556557 from its reverse (7556556502), we obtain a palindrome (5499999945).

It can be divided in two parts, 205655 and 6557, that added together give a palindrome (212212).

The spelling of 2056556557 in words is "two billion, fifty-six million, five hundred fifty-six thousand, five hundred fifty-seven".