66127546721 has 8 divisors (see below), whose sum is σ = 69102533184. Its totient is φ = 63160883280.

The previous prime is 66127546673. The next prime is 66127546729. The reversal of 66127546721 is 12764572166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66127546721 - 2¹⁸ = 66127284577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66127546729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2064506 + ... + 2096291.

It is an arithmetic number, because the mean of its divisors is an integer number (8637816648).

Almost surely, 2^66127546721 is an apocalyptic number.

It is an amenable number.

66127546721 is a deficient number, since it is larger than the sum of its proper divisors (2974986463).

66127546721 is a wasteful number, since it uses less digits than its factorization.

66127546721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4161511.

The product of its digits is 846720, while the sum is 47.

The spelling of 66127546721 in words is "sixty-six billion, one hundred twenty-seven million, five hundred forty-six thousand, seven hundred twenty-one".