2668519944 has 64 divisors (see below), whose sum is σ = 7458129600. Its totient is φ = 884037888.

The previous prime is 2668519943. The next prime is 2668519951. The reversal of 2668519944 is 4499158662.

2668519944 is a `hidden beast` number, since 26 + 68 + 519 + 9 + 44 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (2668519943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2689 + ... + 73104.

It is an arithmetic number, because the mean of its divisors is an integer number (116533275).

Almost surely, 2^2668519944 is an apocalyptic number.

2668519944 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 2668519944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3729064800).

2668519944 is an abundant number, since it is smaller than the sum of its proper divisors (4789609656).

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

2668519944 is a wasteful number, since it uses less digits than its factorization.

2668519944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75971 (or 75961 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The square root of 2668519944 is about 51657.7191134103. The cubic root of 2668519944 is about 1387.0437219932.

The spelling of 2668519944 in words is "two billion, six hundred sixty-eight million, five hundred nineteen thousand, nine hundred forty-four".