66707044428 has 12 divisors (see below), whose sum is σ = 155649770360. Its totient is φ = 22235681472.

The previous prime is 66707044423. The next prime is 66707044429. The reversal of 66707044428 is 82444070766.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (66707044423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2779460173 + ... + 2779460196.

Almost surely, 2^66707044428 is an apocalyptic number.

It is an amenable number.

66707044428 is an abundant number, since it is smaller than the sum of its proper divisors (88942725932).

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

66707044428 is a wasteful number, since it uses less digits than its factorization.

66707044428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5558920376 (or 5558920374 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 48.

The spelling of 66707044428 in words is "sixty-six billion, seven hundred seven million, forty-four thousand, four hundred twenty-eight".