2006555557 has 4 divisors (see below), whose sum is σ = 2009537740. Its totient is φ = 2003573376.

The previous prime is 2006555521. The next prime is 2006555563. The reversal of 2006555557 is 7555556002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 593848161 + 1412707396 = 24369^2 + 37586^2 .

It is a cyclic number.

It is not a de Polignac number, because 2006555557 - 2¹¹ = 2006553509 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 (2006555357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1490082 + ... + 1491427.

It is an arithmetic number, because the mean of its divisors is an integer number (502384435).

Almost surely, 2^2006555557 is an apocalyptic number.

It is an amenable number.

2006555557 is a deficient number, since it is larger than the sum of its proper divisors (2982183).

2006555557 is an equidigital number, since it uses as much as digits as its factorization.

2006555557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2982182.

The product of its (nonzero) digits is 262500, while the sum is 40.

The square root of 2006555557 is about 44794.5929437918. The cubic root of 2006555557 is about 1261.2961292952.

The spelling of 2006555557 in words is "two billion, six million, five hundred fifty-five thousand, five hundred fifty-seven".