66199777249 has 8 divisors (see below), whose sum is σ = 66898198080. Its totient is φ = 65502833136.

The previous prime is 66199777247. The next prime is 66199777279. The reversal of 66199777249 is 94277799166.

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 66199777249 - 2¹ = 66199777247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66199777247) 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, 278934 + ... + 458479.

It is an arithmetic number, because the mean of its divisors is an integer number (8362274760).

Almost surely, 2^66199777249 is an apocalyptic number.

It is an amenable number.

66199777249 is a deficient number, since it is larger than the sum of its proper divisors (698420831).

66199777249 is a wasteful number, since it uses less digits than its factorization.

66199777249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738359.

The product of its digits is 72013536, while the sum is 67.

The spelling of 66199777249 in words is "sixty-six billion, one hundred ninety-nine million, seven hundred seventy-seven thousand, two hundred forty-nine".