2605665777756 has 12 divisors (see below), whose sum is σ = 6079886814792. Its totient is φ = 868555259248.

The previous prime is 2605665777731. The next prime is 2605665777811. The reversal of 2605665777756 is 6577775665062.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108569407395 + ... + 108569407418.

It is an arithmetic number, because the mean of its divisors is an integer number (506657234566).

Almost surely, 2^{2605665777756} is an apocalyptic number.

It is an amenable number.

2605665777756 is an abundant number, since it is smaller than the sum of its proper divisors (3474221037036).

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

2605665777756 is a wasteful number, since it uses less digits than its factorization.

2605665777756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217138814820 (or 217138814818 counting only the distinct ones).

The product of its (nonzero) digits is 777924000, while the sum is 69.

The spelling of 2605665777756 in words is "two trillion, six hundred five billion, six hundred sixty-five million, seven hundred seventy-seven thousand, seven hundred fifty-six".