2005261686 has 24 divisors (see below), whose sum is σ = 4347784584. Its totient is φ = 667951200.

The previous prime is 2005261681. The next prime is 2005261703. The reversal of 2005261686 is 6861625002.

It is a self number, because there is not a number n which added to its sum of digits gives 2005261686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005261681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12271 + ... + 64506.

It is an arithmetic number, because the mean of its divisors is an integer number (181157691).

Almost surely, 2^2005261686 is an apocalyptic number.

2005261686 is an abundant number, since it is smaller than the sum of its proper divisors (2342522898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2005261686 is a wasteful number, since it uses less digits than its factorization.

2005261686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78236 (or 78233 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 2005261686 is about 44780.1483472308. The cubic root of 2005261686 is about 1261.0249672073.

Adding to 2005261686 its reverse (6861625002), we get a palindrome (8866886688).

The spelling of 2005261686 in words is "two billion, five million, two hundred sixty-one thousand, six hundred eighty-six".