6681800437 has 16 divisors (see below), whose sum is σ = 7412375152. Its totient is φ = 5983165440.

The previous prime is 6681800429. The next prime is 6681800443. The reversal of 6681800437 is 7340081866.

It can be written as a sum of positive squares in 8 ways, for example, as 486378916 + 6195421521 = 22054^2 + 78711^2 .

It is a cyclic number.

It is not a de Polignac number, because 6681800437 - 2³ = 6681800429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6681800393 and 6681800402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6681800467) 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 15 ways as a sum of consecutive naturals, for example, 141487 + ... + 182707.

It is an arithmetic number, because the mean of its divisors is an integer number (463273447).

Almost surely, 2^6681800437 is an apocalyptic number.

It is an amenable number.

6681800437 is a deficient number, since it is larger than the sum of its proper divisors (730574715).

6681800437 is a wasteful number, since it uses less digits than its factorization.

6681800437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41608.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 6681800437 is about 81742.2805957847. The cubic root of 6681800437 is about 1883.4951238006.

The spelling of 6681800437 in words is "six billion, six hundred eighty-one million, eight hundred thousand, four hundred thirty-seven".