66544009068 has 54 divisors (see below), whose sum is σ = 156893657284. Its totient is φ = 21951680128.

The previous prime is 66544009061. The next prime is 66544009069. The reversal of 66544009068 is 86090044566.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66544009061) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 100976923 + ... + 100977581.

Almost surely, 2^66544009068 is an apocalyptic number.

It is an amenable number.

66544009068 is an abundant number, since it is smaller than the sum of its proper divisors (90349648216).

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

66544009068 is an equidigital number, since it uses as much as digits as its factorization.

66544009068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1551 (or 777 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 48.

Multiplying 66544009068 by its sum of digits (48), we get a square (3194112435264 = 1787208²).

The spelling of 66544009068 in words is "sixty-six billion, five hundred forty-four million, nine thousand, sixty-eight".