66168127807 has 4 divisors (see below), whose sum is σ = 66188699296. Its totient is φ = 66147556320.

The previous prime is 66168127801. The next prime is 66168127811. The reversal of 66168127807 is 70872186166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66168127807 - 2²⁷ = 66033910079 is a prime.

It is a super-2 number, since 2×66168127807² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66168127801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10280919 + ... + 10287352.

It is an arithmetic number, because the mean of its divisors is an integer number (16547174824).

Almost surely, 2^66168127807 is an apocalyptic number.

66168127807 is a deficient number, since it is larger than the sum of its proper divisors (20571489).

66168127807 is a wasteful number, since it uses less digits than its factorization.

66168127807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20571488.

The product of its (nonzero) digits is 1354752, while the sum is 52.

The spelling of 66168127807 in words is "sixty-six billion, one hundred sixty-eight million, one hundred twenty-seven thousand, eight hundred seven".