2668551381 has 6 divisors (see below), whose sum is σ = 3854574230. Its totient is φ = 1779034248.

The previous prime is 2668551367. The next prime is 2668551437. The reversal of 2668551381 is 1831558662.

2668551381 is a `hidden beast` number, since 2 + 6 + 68 + 551 + 38 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2663488881 + 5062500 = 51609^2 + 2250^2 .

It is not a de Polignac number, because 2668551381 - 2⁶ = 2668551317 is a prime.

It is a super-2 number, since 2×2668551381² = 14242332946074014322, 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 (2668551181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 148252846 + ... + 148252863.

Almost surely, 2^2668551381 is an apocalyptic number.

It is an amenable number.

2668551381 is a deficient number, since it is larger than the sum of its proper divisors (1186022849).

2668551381 is a wasteful number, since it uses less digits than its factorization.

2668551381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296505715 (or 296505712 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 2668551381 is about 51658.0233942415. The cubic root of 2668551381 is about 1387.0491687482.

The spelling of 2668551381 in words is "two billion, six hundred sixty-eight million, five hundred fifty-one thousand, three hundred eighty-one".