2668447381 has 12 divisors (see below), whose sum is σ = 2981954412. Its totient is φ = 2379291264.

The previous prime is 2668447351. The next prime is 2668447393. The reversal of 2668447381 is 1837448662.

2668447381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2419754481 + 248692900 = 49191^2 + 15770^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2668447381 is a prime.

It is a super-2 number, since 2×2668447381² = 14241222850331518322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2668447351) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 211270 + ... + 223543.

It is an arithmetic number, because the mean of its divisors is an integer number (248496201).

Almost surely, 2^2668447381 is an apocalyptic number.

It is an amenable number.

2668447381 is a deficient number, since it is larger than the sum of its proper divisors (313507031).

2668447381 is a wasteful number, since it uses less digits than its factorization.

2668447381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434868 (or 434849 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 49.

The square root of 2668447381 is about 51657.0167644242. The cubic root of 2668447381 is about 1387.0311496101.

The spelling of 2668447381 in words is "two billion, six hundred sixty-eight million, four hundred forty-seven thousand, three hundred eighty-one".