66666023687 has 8 divisors (see below), whose sum is σ = 71963324640. Its totient is φ = 61568620960.

The previous prime is 66666023681. The next prime is 66666023689. The reversal of 66666023687 is 78632066666.

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 66666023687 - 2¹⁰ = 66666022663 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 (66666023681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49973864 + ... + 49975197.

It is an arithmetic number, because the mean of its divisors is an integer number (8995415580).

Almost surely, 2^66666023687 is an apocalyptic number.

66666023687 is a deficient number, since it is larger than the sum of its proper divisors (5297300953).

66666023687 is a wasteful number, since it uses less digits than its factorization.

66666023687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99949113.

The product of its (nonzero) digits is 15676416, while the sum is 56.

The spelling of 66666023687 in words is "sixty-six billion, six hundred sixty-six million, twenty-three thousand, six hundred eighty-seven".