2755680721408 has 80 divisors (see below), whose sum is σ = 5702639148360. Its totient is φ = 1330322595840.

The previous prime is 2755680721403. The next prime is 2755680721457. The reversal of 2755680721408 is 8041270865572.

It can be written as a sum of positive squares in 4 ways, for example, as 1951631352064 + 804049369344 = 1397008^2 + 896688^2 .

It is not an unprimeable number, because it can be changed into a prime (2755680721403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12376828 + ... + 12597508.

Almost surely, 2^{2755680721408} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2755680721408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2851319574180).

2755680721408 is an abundant number, since it is smaller than the sum of its proper divisors (2946958426952).

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

2755680721408 is an frugal number, since it uses more digits than its factorization.

2755680721408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220786 (or 220712 counting only the distinct ones).

The product of its (nonzero) digits is 7526400, while the sum is 55.

The spelling of 2755680721408 in words is "two trillion, seven hundred fifty-five billion, six hundred eighty million, seven hundred twenty-one thousand, four hundred eight".