66723900067 has 4 divisors (see below), whose sum is σ = 72789709176. Its totient is φ = 60658090960.

The previous prime is 66723900043. The next prime is 66723900107. The reversal of 66723900067 is 76000932766.

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 66723900067 - 2²³ = 66715511459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66723900007) 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 3 ways as a sum of consecutive naturals, for example, 3032904538 + ... + 3032904559.

It is an arithmetic number, because the mean of its divisors is an integer number (18197427294).

Almost surely, 2^66723900067 is an apocalyptic number.

66723900067 is a deficient number, since it is larger than the sum of its proper divisors (6065809109).

66723900067 is a wasteful number, since it uses less digits than its factorization.

66723900067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6065809108.

The product of its (nonzero) digits is 571536, while the sum is 46.

The spelling of 66723900067 in words is "sixty-six billion, seven hundred twenty-three million, nine hundred thousand, sixty-seven".