2005051888685 has 4 divisors (see below), whose sum is σ = 2406062266428. Its totient is φ = 1604041510944.

The previous prime is 2005051888667. The next prime is 2005051888691. The reversal of 2005051888685 is 5868881505002.

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 219851267689 + 1785200620996 = 468883^2 + 1336114^2 .

It is a cyclic number.

It is not a de Polignac number, because 2005051888685 - 2³⁸ = 1730173981741 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2005051888685.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200505188864 + ... + 200505188873.

It is an arithmetic number, because the mean of its divisors is an integer number (601515566607).

Almost surely, 2^{2005051888685} is an apocalyptic number.

It is an amenable number.

2005051888685 is a deficient number, since it is larger than the sum of its proper divisors (401010377743).

2005051888685 is an equidigital number, since it uses as much as digits as its factorization.

2005051888685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401010377742.

The product of its (nonzero) digits is 6144000, while the sum is 56.

The spelling of 2005051888685 in words is "two trillion, five billion, fifty-one million, eight hundred eighty-eight thousand, six hundred eighty-five".