10561506666 has 32 divisors (see below), whose sum is σ = 23337963648. Its totient is φ = 3169351680.

The previous prime is 10561506623. The next prime is 10561506671. The reversal of 10561506666 is 66660516501.

It is a super-2 number, since 2×10561506666² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2248615 + ... + 2253306.

It is an arithmetic number, because the mean of its divisors is an integer number (729311364).

Almost surely, 2^10561506666 is an apocalyptic number.

10561506666 is an abundant number, since it is smaller than the sum of its proper divisors (12776456982).

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

10561506666 is a wasteful number, since it uses less digits than its factorization.

10561506666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4501966.

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

The spelling of 10561506666 in words is "ten billion, five hundred sixty-one million, five hundred six thousand, six hundred sixty-six".