6681555468 has 36 divisors (see below), whose sum is σ = 19302272080. Its totient is φ = 1909015776.

The previous prime is 6681555431. The next prime is 6681555469. The reversal of 6681555468 is 8645551866.

6681555468 is a `hidden beast` number, since 6 + 6 + 81 + 5 + 554 + 6 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (6681555469) 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, 13256803 + ... + 13257306.

Almost surely, 2^6681555468 is an apocalyptic number.

It is an amenable number.

6681555468 is an abundant number, since it is smaller than the sum of its proper divisors (12620716612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6681555468 is a wasteful number, since it uses less digits than its factorization.

6681555468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26514126 (or 26514121 counting only the distinct ones).

The product of its digits is 6912000, while the sum is 54.

The square root of 6681555468 is about 81740.7821592135. The cubic root of 6681555468 is about 1883.4721058750.

The spelling of 6681555468 in words is "six billion, six hundred eighty-one million, five hundred fifty-five thousand, four hundred sixty-eight".