66566290266 has 128 divisors (see below), whose sum is σ = 178570444800. Its totient is φ = 17977256640.

The previous prime is 66566290253. The next prime is 66566290267. The reversal of 66566290266 is 66209266566.

66566290266 is a `hidden beast` number, since 6 + 6 + 5 + 6 + 629 + 0 + 2 + 6 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66566290267) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 437820 + ... + 569928.

It is an arithmetic number, because the mean of its divisors is an integer number (1395081600).

Almost surely, 2^66566290266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66566290266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89285222400).

66566290266 is an abundant number, since it is smaller than the sum of its proper divisors (112004154534).

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

66566290266 is a wasteful number, since it uses less digits than its factorization.

66566290266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132201 (or 132195 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 54.

The spelling of 66566290266 in words is "sixty-six billion, five hundred sixty-six million, two hundred ninety thousand, two hundred sixty-six".