66328262527778 has 32 divisors (see below), whose sum is σ = 108193058185968. Its totient is φ = 30369413376000.

The previous prime is 66328262527771. The next prime is 66328262527789. The reversal of 66328262527778 is 87772526282366.

It can be written as a sum of positive squares in 8 ways, for example, as 56164427569849 + 10163834957929 = 7494293^2 + 3188077^2 .

It is not an unprimeable number, because it can be changed into a prime (66328262527771) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 197213438 + ... + 197549478.

Almost surely, 2^{66328262527778} is an apocalyptic number.

66328262527778 is a deficient number, since it is larger than the sum of its proper divisors (41864795658190).

66328262527778 is a wasteful number, since it uses less digits than its factorization.

66328262527778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492998.

The product of its digits is 1137991680, while the sum is 71.

The spelling of 66328262527778 in words is "sixty-six trillion, three hundred twenty-eight billion, two hundred sixty-two million, five hundred twenty-seven thousand, seven hundred seventy-eight".