7380781066681 has 32 divisors (see below), whose sum is σ = 8391938273280. Its totient is φ = 6434069241600.

The previous prime is 7380781066667. The next prime is 7380781066741. The reversal of 7380781066681 is 1866601870837.

It is a happy number.

It is not a de Polignac number, because 7380781066681 - 2¹⁹ = 7380780542393 is a prime.

It is a super-2 number, since 2×7380781066681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7380781069681) 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, 3241105 + ... + 5026561.

It is an arithmetic number, because the mean of its divisors is an integer number (262248071040).

Almost surely, 2^{7380781066681} is an apocalyptic number.

7380781066681 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

7380781066681 is a deficient number, since it is larger than the sum of its proper divisors (1011157206599).

7380781066681 is a wasteful number, since it uses less digits than its factorization.

7380781066681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785685.

The product of its (nonzero) digits is 16257024, while the sum is 61.

The spelling of 7380781066681 in words is "seven trillion, three hundred eighty billion, seven hundred eighty-one million, sixty-six thousand, six hundred eighty-one".