66600071999 has 8 divisors (see below), whose sum is σ = 67848960960. Its totient is φ = 65356250400.

The previous prime is 66600071987. The next prime is 66600072043. The reversal of 66600071999 is 99917000666.

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 66600071999 - 2⁴ = 66600071983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66600071999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66600071099) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1240304 + ... + 1292885.

It is an arithmetic number, because the mean of its divisors is an integer number (8481120120).

Almost surely, 2^66600071999 is an apocalyptic number.

66600071999 is a deficient number, since it is larger than the sum of its proper divisors (1248888961).

66600071999 is a wasteful number, since it uses less digits than its factorization.

66600071999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2533681.

The product of its (nonzero) digits is 1102248, while the sum is 53.

The spelling of 66600071999 in words is "sixty-six billion, six hundred million, seventy-one thousand, nine hundred ninety-nine".