6815809130 has 32 divisors (see below), whose sum is σ = 13244590800. Its totient is φ = 2510433792.

The previous prime is 6815809123. The next prime is 6815809153. The reversal of 6815809130 is 319085186.

6815809130 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 5635955329 + 1179853801 = 75073^2 + 34349^2 .

It is a Curzon number.

It is an unprimeable number.

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, 10925 + ... + 117264.

Almost surely, 2^6815809130 is an apocalyptic number.

6815809130 is a deficient number, since it is larger than the sum of its proper divisors (6428781670).

6815809130 is a wasteful number, since it uses less digits than its factorization.

6815809130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128618.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 6815809130 is about 82557.9137938938. The cubic root of 6815809130 is about 1896.0035230296.

The spelling of 6815809130 in words is "six billion, eight hundred fifteen million, eight hundred nine thousand, one hundred thirty".