7686543781 has 16 divisors (see below), whose sum is σ = 8821716480. Its totient is φ = 6560699760.

The previous prime is 7686543779. The next prime is 7686543791. The reversal of 7686543781 is 1873456867.

It is a cyclic number.

It is not a de Polignac number, because 7686543781 - 2¹ = 7686543779 is a prime.

It is a super-2 number, since 2×7686543781² (a number of 21 digits) 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 (7686543721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2356930 + ... + 2360188.

It is an arithmetic number, because the mean of its divisors is an integer number (551357280).

Almost surely, 2^7686543781 is an apocalyptic number.

It is an amenable number.

7686543781 is a deficient number, since it is larger than the sum of its proper divisors (1135172699).

7686543781 is a wasteful number, since it uses less digits than its factorization.

7686543781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4584.

The product of its digits is 6773760, while the sum is 55.

The square root of 7686543781 is about 87672.9364228209. The cubic root of 7686543781 is about 1973.5298598219.

The spelling of 7686543781 in words is "seven billion, six hundred eighty-six million, five hundred forty-three thousand, seven hundred eighty-one".