66796872121 has 8 divisors (see below), whose sum is σ = 76940380160. Its totient is φ = 56803638528.

The previous prime is 66796872091. The next prime is 66796872127. The reversal of 66796872121 is 12127869766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66796872121 - 2¹⁵ = 66796839353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66796872127) 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, 37567656 + ... + 37569433.

It is an arithmetic number, because the mean of its divisors is an integer number (9617547520).

Almost surely, 2^66796872121 is an apocalyptic number.

It is an amenable number.

66796872121 is a deficient number, since it is larger than the sum of its proper divisors (10143508039).

66796872121 is a wasteful number, since it uses less digits than its factorization.

66796872121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75137223.

The product of its digits is 3048192, while the sum is 55.

The spelling of 66796872121 in words is "sixty-six billion, seven hundred ninety-six million, eight hundred seventy-two thousand, one hundred twenty-one".