6981345687 has 32 divisors (see below), whose sum is σ = 9969062400. Its totient is φ = 4335990912.

The previous prime is 6981345671. The next prime is 6981345689. The reversal of 6981345687 is 7865431896.

It is not a de Polignac number, because 6981345687 - 2⁴ = 6981345671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6981345689) 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, 435873 + ... + 451605.

It is an arithmetic number, because the mean of its divisors is an integer number (311533200).

Almost surely, 2^6981345687 is an apocalyptic number.

6981345687 is a deficient number, since it is larger than the sum of its proper divisors (2987716713).

6981345687 is a wasteful number, since it uses less digits than its factorization.

6981345687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15927.

The product of its digits is 8709120, while the sum is 57.

The square root of 6981345687 is about 83554.4474399777. The cubic root of 6981345687 is about 1911.2304131279.

The spelling of 6981345687 in words is "six billion, nine hundred eighty-one million, three hundred forty-five thousand, six hundred eighty-seven".