66741715667 has 24 divisors (see below), whose sum is σ = 73961448960. Its totient is φ = 60178734000.

The previous prime is 66741715619. The next prime is 66741715669. The reversal of 66741715667 is 76651714766.

It is not a de Polignac number, because 66741715667 - 2¹² = 66741711571 is a prime.

It is a super-2 number, since 2×66741715667² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66741715669) 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 23 ways as a sum of consecutive naturals, for example, 13499798 + ... + 13504740.

It is an arithmetic number, because the mean of its divisors is an integer number (3081727040).

Almost surely, 2^66741715667 is an apocalyptic number.

66741715667 is a deficient number, since it is larger than the sum of its proper divisors (7219733293).

66741715667 is a wasteful number, since it uses less digits than its factorization.

66741715667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5855 (or 5844 counting only the distinct ones).

The product of its digits is 8890560, while the sum is 56.

Subtracting 66741715667 from its reverse (76651714766), we obtain a palindrome (9909999099).

The spelling of 66741715667 in words is "sixty-six billion, seven hundred forty-one million, seven hundred fifteen thousand, six hundred sixty-seven".