66872272793 has 4 divisors (see below), whose sum is σ = 66877053540. Its totient is φ = 66867492048.

The previous prime is 66872272769. The next prime is 66872272799. The reversal of 66872272793 is 39727227866.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13992050944 + 52880221849 = 118288^2 + 229957^2 .

It is a cyclic number.

It is not a de Polignac number, because 66872272793 - 2⁶ = 66872272729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66872272799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2369330 + ... + 2397387.

It is an arithmetic number, because the mean of its divisors is an integer number (16719263385).

Almost surely, 2^66872272793 is an apocalyptic number.

It is an amenable number.

66872272793 is a deficient number, since it is larger than the sum of its proper divisors (4780747).

66872272793 is a wasteful number, since it uses less digits than its factorization.

66872272793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4780746.

The product of its digits is 21337344, while the sum is 59.

The spelling of 66872272793 in words is "sixty-six billion, eight hundred seventy-two million, two hundred seventy-two thousand, seven hundred ninety-three".