6681902409 has 128 divisors (see below), whose sum is σ = 12921896960. Its totient is φ = 3317241600.

The previous prime is 6681902407. The next prime is 6681902449. The reversal of 6681902409 is 9042091866.

It is a happy number.

It is not a de Polignac number, because 6681902409 - 2¹ = 6681902407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6681902407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2816994 + ... + 2819364.

It is an arithmetic number, because the mean of its divisors is an integer number (100952320).

Almost surely, 2^6681902409 is an apocalyptic number.

It is an amenable number.

6681902409 is a deficient number, since it is larger than the sum of its proper divisors (6239994551).

6681902409 is a wasteful number, since it uses less digits than its factorization.

6681902409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2468 (or 2462 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 6681902409 is about 81742.9043342601. The cubic root of 6681902409 is about 1883.5047051896.

The spelling of 6681902409 in words is "six billion, six hundred eighty-one million, nine hundred two thousand, four hundred nine".