66280644185 has 8 divisors (see below), whose sum is σ = 90899169216. Its totient is φ = 45449584560.

The previous prime is 66280644179. The next prime is 66280644217. The reversal of 66280644185 is 58144608266.

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

It is not a de Polignac number, because 66280644185 - 2⁸ = 66280643929 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 946866311 + ... + 946866380.

It is an arithmetic number, because the mean of its divisors is an integer number (11362396152).

Almost surely, 2^66280644185 is an apocalyptic number.

It is an amenable number.

66280644185 is a deficient number, since it is larger than the sum of its proper divisors (24618525031).

66280644185 is a wasteful number, since it uses less digits than its factorization.

66280644185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1893732703.

The product of its (nonzero) digits is 2211840, while the sum is 50.

The spelling of 66280644185 in words is "sixty-six billion, two hundred eighty million, six hundred forty-four thousand, one hundred eighty-five".