6557066200021 has 16 divisors (see below), whose sum is σ = 6597647175600. Its totient is φ = 6516624457728.

The previous prime is 6557066199977. The next prime is 6557066200031. The reversal of 6557066200021 is 1200026607556.

It can be written as a sum of positive squares in 8 ways, for example, as 416141108100 + 6140925091921 = 645090^2 + 2478089^2 .

It is a cyclic number.

It is not a de Polignac number, because 6557066200021 - 2¹⁹ = 6557065675733 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 (6557066200031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 369840885 + ... + 369858613.

It is an arithmetic number, because the mean of its divisors is an integer number (412352948475).

Almost surely, 2^{6557066200021} is an apocalyptic number.

It is an amenable number.

6557066200021 is a deficient number, since it is larger than the sum of its proper divisors (40580975579).

6557066200021 is a wasteful number, since it uses less digits than its factorization.

6557066200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21528.

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 6557066200021 in words is "six trillion, five hundred fifty-seven billion, sixty-six million, two hundred thousand, twenty-one".