66550742772 has 12 divisors (see below), whose sum is σ = 155285066496. Its totient is φ = 22183580920.

The previous prime is 66550742767. The next prime is 66550742773. The reversal of 66550742772 is 27724705566.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66550742773) 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, 2772947604 + ... + 2772947627.

It is an arithmetic number, because the mean of its divisors is an integer number (12940422208).

Almost surely, 2^66550742772 is an apocalyptic number.

It is an amenable number.

66550742772 is an abundant number, since it is smaller than the sum of its proper divisors (88734323724).

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

66550742772 is a wasteful number, since it uses less digits than its factorization.

66550742772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5545895238 (or 5545895236 counting only the distinct ones).

The product of its (nonzero) digits is 4939200, while the sum is 51.

The spelling of 66550742772 in words is "sixty-six billion, five hundred fifty million, seven hundred forty-two thousand, seven hundred seventy-two".