66604040226 has 24 divisors (see below), whose sum is σ = 147828481164. Its totient is φ = 21659850240.

The previous prime is 66604040207. The next prime is 66604040227. The reversal of 66604040226 is 62204040666.

It can be written as a sum of positive squares in 2 ways, for example, as 66587222025 + 16818201 = 258045^2 + 4101^2 .

It is a super-2 number, since 2×66604040226² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66604040227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45123951 + ... + 45125426.

Almost surely, 2^66604040226 is an apocalyptic number.

66604040226 is an abundant number, since it is smaller than the sum of its proper divisors (81224440938).

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

66604040226 is a wasteful number, since it uses less digits than its factorization.

66604040226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90249426 (or 90249423 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

It can be divided in two parts, 666040 and 40226, that added together give a triangular number (706266 = T₁₁₈₈).

The spelling of 66604040226 in words is "sixty-six billion, six hundred four million, forty thousand, two hundred twenty-six".