6681121507 has 4 divisors (see below), whose sum is σ = 6681311640. Its totient is φ = 6680931376.

The previous prime is 6681121501. The next prime is 6681121511. The reversal of 6681121507 is 7051211866.

6681121507 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6681121507 - 2⁷ = 6681121379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6681121501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25282 + ... + 118327.

It is an arithmetic number, because the mean of its divisors is an integer number (1670327910).

Almost surely, 2^6681121507 is an apocalyptic number.

6681121507 is a deficient number, since it is larger than the sum of its proper divisors (190133).

6681121507 is a wasteful number, since it uses less digits than its factorization.

6681121507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190132.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 6681121507 is about 81738.1276210802. The cubic root of 6681121507 is about 1883.4313283874.

The spelling of 6681121507 in words is "six billion, six hundred eighty-one million, one hundred twenty-one thousand, five hundred seven".