6454188660681 has 24 divisors (see below), whose sum is σ = 9474719933640. Its totient is φ = 4232940270336.

The previous prime is 6454188660677. The next prime is 6454188660683. The reversal of 6454188660681 is 1860668814546.

6454188660681 is a `hidden beast` number, since 6 + 4 + 5 + 4 + 18 + 8 + 6 + 606 + 8 + 1 = 666.

6454188660681 is digitally balanced in base 3, 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 4 ways, for example, as 43468497081 + 6410720163600 = 208491^2 + 2531940^2 .

It is not a de Polignac number, because 6454188660681 - 2² = 6454188660677 is a prime.

It is a super-2 number, since 2×6454188660681² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6454188660683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12371326 + ... + 12882471.

It is an arithmetic number, because the mean of its divisors is an integer number (394779997235).

Almost surely, 2^{6454188660681} is an apocalyptic number.

It is an amenable number.

6454188660681 is a deficient number, since it is larger than the sum of its proper divisors (3020531272959).

6454188660681 is a wasteful number, since it uses less digits than its factorization.

6454188660681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25254265 (or 25254262 counting only the distinct ones).

The product of its (nonzero) digits is 53084160, while the sum is 63.

The spelling of 6454188660681 in words is "six trillion, four hundred fifty-four billion, one hundred eighty-eight million, six hundred sixty thousand, six hundred eighty-one".