66072167699 has 4 divisors (see below), whose sum is σ = 66078036960. Its totient is φ = 66066298440.

The previous prime is 66072167663. The next prime is 66072167713. The reversal of 66072167699 is 99676127066.

It is a happy number.

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 66072167699 - 2¹⁶ = 66072102163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66072167659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2917712 + ... + 2940269.

It is an arithmetic number, because the mean of its divisors is an integer number (16519509240).

Almost surely, 2^66072167699 is an apocalyptic number.

66072167699 is a deficient number, since it is larger than the sum of its proper divisors (5869261).

66072167699 is a wasteful number, since it uses less digits than its factorization.

66072167699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5869260.

The product of its (nonzero) digits is 10287648, while the sum is 59.

The spelling of 66072167699 in words is "sixty-six billion, seventy-two million, one hundred sixty-seven thousand, six hundred ninety-nine".