66872272851 has 24 divisors (see below), whose sum is σ = 97444050704. Its totient is φ = 44190463680.

The previous prime is 66872272807. The next prime is 66872272897. The reversal of 66872272851 is 15827227866.

66872272851 is a `hidden beast` number, since 66 + 87 + 227 + 285 + 1 = 666.

It is not a de Polignac number, because 66872272851 - 2¹⁰ = 66872271827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66872272351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 433245 + ... + 566961.

Almost surely, 2^66872272851 is an apocalyptic number.

66872272851 is a deficient number, since it is larger than the sum of its proper divisors (30571777853).

66872272851 is a wasteful number, since it uses less digits than its factorization.

66872272851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134211 (or 134208 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 54.

The spelling of 66872272851 in words is "sixty-six billion, eight hundred seventy-two million, two hundred seventy-two thousand, eight hundred fifty-one".