6861561081306 has 8 divisors (see below), whose sum is σ = 13723122162624. Its totient is φ = 2287187027100.

The previous prime is 6861561081301. The next prime is 6861561081317. The reversal of 6861561081306 is 6031801651686.

It is a sphenic number, since it is the product of 3 distinct primes.

6861561081306 is an admirable number.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (6861561081301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 571796756770 + ... + 571796756781.

It is an arithmetic number, because the mean of its divisors is an integer number (1715390270328).

Almost surely, 2^{6861561081306} is an apocalyptic number.

6861561081306 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6861561081306 is a wasteful number, since it uses less digits than its factorization.

6861561081306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143593513556.

The product of its (nonzero) digits is 1244160, while the sum is 51.

The spelling of 6861561081306 in words is "six trillion, eight hundred sixty-one billion, five hundred sixty-one million, eighty-one thousand, three hundred six".