2605881685406 has 8 divisors (see below), whose sum is σ = 3908837059104. Its totient is φ = 1302935999040.

The previous prime is 2605881685403. The next prime is 2605881685447. The reversal of 2605881685406 is 6045861885062.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2605881685403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1707155 + ... + 2850638.

It is an arithmetic number, because the mean of its divisors is an integer number (488604632388).

Almost surely, 2^{2605881685406} is an apocalyptic number.

2605881685406 is a deficient number, since it is larger than the sum of its proper divisors (1302955373698).

2605881685406 is a wasteful number, since it uses less digits than its factorization.

2605881685406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4843666.

The product of its (nonzero) digits is 22118400, while the sum is 59.

The spelling of 2605881685406 in words is "two trillion, six hundred five billion, eight hundred eighty-one million, six hundred eighty-five thousand, four hundred six".