66012221066 has 24 divisors (see below), whose sum is σ = 112349258112. Its totient is φ = 29037630600.

The previous prime is 66012221057. The next prime is 66012221101.

66012221066 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×66012221066² (a number of 22 digits) contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 4392140 + ... + 4407143.

It is an arithmetic number, because the mean of its divisors is an integer number (4681219088).

Almost surely, 2^66012221066 is an apocalyptic number.

66012221066 is a deficient number, since it is larger than the sum of its proper divisors (46337037046).

66012221066 is a wasteful number, since it uses less digits than its factorization.

66012221066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8799338 (or 8799327 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 66012221066 in words is "sixty-six billion, twelve million, two hundred twenty-one thousand, sixty-six".