66860226800639 has 4 divisors (see below), whose sum is σ = 69165751862760. Its totient is φ = 64554701738520.

The previous prime is 66860226800623. The next prime is 66860226800663. The reversal of 66860226800639 is 93600862206866.

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

It is not a de Polignac number, because 66860226800639 - 2⁴ = 66860226800623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66860226800839) 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, 1152762531017 + ... + 1152762531074.

It is an arithmetic number, because the mean of its divisors is an integer number (17291437965690).

Almost surely, 2^{66860226800639} is an apocalyptic number.

66860226800639 is a deficient number, since it is larger than the sum of its proper divisors (2305525062121).

66860226800639 is a wasteful number, since it uses less digits than its factorization.

66860226800639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2305525062120.

The product of its (nonzero) digits is 53747712, while the sum is 62.

The spelling of 66860226800639 in words is "sixty-six trillion, eight hundred sixty billion, two hundred twenty-six million, eight hundred thousand, six hundred thirty-nine".