66111661127 has 8 divisors (see below), whose sum is σ = 69181517664. Its totient is φ = 63058091008.

The previous prime is 66111661123. The next prime is 66111661129. The reversal of 66111661127 is 72116611166.

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

It is a cyclic number.

It is not a de Polignac number, because 66111661127 - 2² = 66111661123 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66111661123) 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, 4063298 + ... + 4079535.

It is an arithmetic number, because the mean of its divisors is an integer number (8647689708).

Almost surely, 2^66111661127 is an apocalyptic number.

66111661127 is a deficient number, since it is larger than the sum of its proper divisors (3069856537).

66111661127 is a wasteful number, since it uses less digits than its factorization.

66111661127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8143209.

The product of its digits is 18144, while the sum is 38.

The spelling of 66111661127 in words is "sixty-six billion, one hundred eleven million, six hundred sixty-one thousand, one hundred twenty-seven".