66717681127 has 8 divisors (see below), whose sum is σ = 68632664576. Its totient is φ = 64808582112.

The previous prime is 66717681103. The next prime is 66717681139. The reversal of 66717681127 is 72118671766.

It is a happy number.

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 66717681127 - 2¹⁵ = 66717648359 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 (66717681187) 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, 1448103 + ... + 1493464.

It is an arithmetic number, because the mean of its divisors is an integer number (8579083072).

Almost surely, 2^66717681127 is an apocalyptic number.

66717681127 is a deficient number, since it is larger than the sum of its proper divisors (1914983449).

66717681127 is a wasteful number, since it uses less digits than its factorization.

66717681127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2942217.

The product of its digits is 1185408, while the sum is 52.

The spelling of 66717681127 in words is "sixty-six billion, seven hundred seventeen million, six hundred eighty-one thousand, one hundred twenty-seven".