6681398361 has 16 divisors (see below), whose sum is σ = 10290068928. Its totient is φ = 3811136000.

The previous prime is 6681398341. The next prime is 6681398387. The reversal of 6681398361 is 1638931866.

It is a cyclic number.

It is not a de Polignac number, because 6681398361 - 2⁵ = 6681398329 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (6681398341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5954340 + ... + 5955461.

It is an arithmetic number, because the mean of its divisors is an integer number (643129308).

Almost surely, 2^6681398361 is an apocalyptic number.

It is an amenable number.

6681398361 is a deficient number, since it is larger than the sum of its proper divisors (3608670567).

6681398361 is a wasteful number, since it uses less digits than its factorization.

6681398361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11909832.

The product of its digits is 1119744, while the sum is 51.

The square root of 6681398361 is about 81739.8211461219. The cubic root of 6681398361 is about 1883.4573433958.

The spelling of 6681398361 in words is "six billion, six hundred eighty-one million, three hundred ninety-eight thousand, three hundred sixty-one".