66539118129 has 16 divisors (see below), whose sum is σ = 96788501760. Its totient is φ = 40324934160.

The previous prime is 66539118109. The next prime is 66539118211. The reversal of 66539118129 is 92181193566.

It is not a de Polignac number, because 66539118129 - 2²⁰ = 66538069553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66539118109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1323942 + ... + 1373280.

It is an arithmetic number, because the mean of its divisors is an integer number (6049281360).

Almost surely, 2^66539118129 is an apocalyptic number.

It is an amenable number.

66539118129 is a deficient number, since it is larger than the sum of its proper divisors (30249383631).

66539118129 is a wasteful number, since it uses less digits than its factorization.

66539118129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90220.

The product of its digits is 699840, while the sum is 51.

The spelling of 66539118129 in words is "sixty-six billion, five hundred thirty-nine million, one hundred eighteen thousand, one hundred twenty-nine".