8666220261 has 16 divisors (see below), whose sum is σ = 11674061568. Its totient is φ = 5717976000.

The previous prime is 8666220239. The next prime is 8666220263. The reversal of 8666220261 is 1620226668.

8666220261 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8666220261 - 2¹⁸ = 8665958117 is a prime.

It is a super-2 number, since 2×8666220261² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8666220263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1096255 + ... + 1104131.

It is an arithmetic number, because the mean of its divisors is an integer number (729628848).

Almost surely, 2^8666220261 is an apocalyptic number.

It is an amenable number.

8666220261 is a deficient number, since it is larger than the sum of its proper divisors (3007841307).

8666220261 is a wasteful number, since it uses less digits than its factorization.

8666220261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11612.

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 8666220261 is about 93092.5360112184. The cubic root of 8666220261 is about 2054.0447812221.

The spelling of 8666220261 in words is "eight billion, six hundred sixty-six million, two hundred twenty thousand, two hundred sixty-one".