66885338884 has 189 divisors, whose sum is σ = 153144635007. Its totient is φ = 25547715648.

The previous prime is 66885338833. The next prime is 66885338911. The reversal of 66885338884 is 48883358866.

The square root of 66885338884 is 258622.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 8576612100 + 58308726784 = 92610^2 + 241472^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 2306390982 + ... + 2306391010.

Almost surely, 2^66885338884 is an apocalyptic number.

66885338884 is the 258622-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66885338884

66885338884 is an abundant number, since it is smaller than the sum of its proper divisors (86259296123).

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

66885338884 is an frugal number, since it uses more digits than its factorization.

66885338884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130 (or 51 counting only the distinct ones).

The product of its digits is 212336640, while the sum is 67.

It can be divided in two parts, 66885 and 338884, that added together give a square (405769 = 637²).

The spelling of 66885338884 in words is "sixty-six billion, eight hundred eighty-five million, three hundred thirty-eight thousand, eight hundred eighty-four".