10561066566 has 8 divisors (see below), whose sum is σ = 21122133144. Its totient is φ = 3520355520.

The previous prime is 10561066513. The next prime is 10561066591. The reversal of 10561066566 is 66566016501.

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

10561066566 is an admirable number.

It is a super-2 number, since 2×10561066566² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 880088875 + ... + 880088886.

It is an arithmetic number, because the mean of its divisors is an integer number (2640266643).

Almost surely, 2^10561066566 is an apocalyptic number.

10561066566 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.

10561066566 is a wasteful number, since it uses less digits than its factorization.

10561066566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1760177766.

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 10561066566 in words is "ten billion, five hundred sixty-one million, sixty-six thousand, five hundred sixty-six".