6566105861 has 16 divisors (see below), whose sum is σ = 7980524160. Its totient is φ = 5276897280.

The previous prime is 6566105851. The next prime is 6566105881. The reversal of 6566105861 is 1685016656.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6566105861 is a prime.

It is a super-2 number, since 2×6566105861² = 86227492355717102642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6566105831) 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, 241580 + ... + 267381.

It is an arithmetic number, because the mean of its divisors is an integer number (498782760).

Almost surely, 2^6566105861 is an apocalyptic number.

It is an amenable number.

6566105861 is a deficient number, since it is larger than the sum of its proper divisors (1414418299).

6566105861 is a wasteful number, since it uses less digits than its factorization.

6566105861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509084.

The product of its (nonzero) digits is 259200, while the sum is 44.

The square root of 6566105861 is about 81031.5115310087. The cubic root of 6566105861 is about 1872.5609398332.

The spelling of 6566105861 in words is "six billion, five hundred sixty-six million, one hundred five thousand, eight hundred sixty-one".