66541588266 has 16 divisors (see below), whose sum is σ = 133116077088. Its totient is φ = 22175046000.

The previous prime is 66541588219. The next prime is 66541588277. The reversal of 66541588266 is 66288514566.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1344525 + ... + 1393136.

It is an arithmetic number, because the mean of its divisors is an integer number (8319754818).

Almost surely, 2^66541588266 is an apocalyptic number.

66541588266 is an abundant number, since it is smaller than the sum of its proper divisors (66574488822).

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

66541588266 is a wasteful number, since it uses less digits than its factorization.

66541588266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2741717.

The product of its digits is 16588800, while the sum is 57.

The spelling of 66541588266 in words is "sixty-six billion, five hundred forty-one million, five hundred eighty-eight thousand, two hundred sixty-six".