2605206645844 has 24 divisors (see below), whose sum is σ = 4973629576608. Its totient is φ = 1184172159840.

The previous prime is 2605206645803. The next prime is 2605206645857. The reversal of 2605206645844 is 4485466025062.

It is a junction number, because it is equal to n+sod(n) for n = 2605206645791 and 2605206645800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4748767 + ... + 5268889.

It is an arithmetic number, because the mean of its divisors is an integer number (207234565692).

Almost surely, 2^{2605206645844} is an apocalyptic number.

It is an amenable number.

2605206645844 is a deficient number, since it is larger than the sum of its proper divisors (2368422930764).

2605206645844 is a wasteful number, since it uses less digits than its factorization.

2605206645844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633975 (or 633973 counting only the distinct ones).

The product of its (nonzero) digits is 11059200, while the sum is 52.

The spelling of 2605206645844 in words is "two trillion, six hundred five billion, two hundred six million, six hundred forty-five thousand, eight hundred forty-four".