2665838888544 has 192 divisors, whose sum is σ = 7713913181184. Its totient is φ = 800985808896.

The previous prime is 2665838888543. The next prime is 2665838888563. The reversal of 2665838888544 is 4458888385662.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665838888543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25933312 + ... + 26035904.

It is an arithmetic number, because the mean of its divisors is an integer number (40176631152).

Almost surely, 2^{2665838888544} is an apocalyptic number.

2665838888544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2665838888544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3856956590592).

2665838888544 is an abundant number, since it is smaller than the sum of its proper divisors (5048074292640).

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

2665838888544 is a wasteful number, since it uses less digits than its factorization.

2665838888544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103109 (or 103101 counting only the distinct ones).

The product of its digits is 2831155200, while the sum is 75.

The spelling of 2665838888544 in words is "two trillion, six hundred sixty-five billion, eight hundred thirty-eight million, eight hundred eighty-eight thousand, five hundred forty-four".