66639268943 has 8 divisors (see below), whose sum is σ = 73515741936. Its totient is φ = 60012849600.

The previous prime is 66639268921. The next prime is 66639268961. The reversal of 66639268943 is 34986293666.

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

It is a cyclic number.

It is not a de Polignac number, because 66639268943 - 2³² = 62344301647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66639268543) 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, 62512853 + ... + 62513918.

It is an arithmetic number, because the mean of its divisors is an integer number (9189467742).

Almost surely, 2^66639268943 is an apocalyptic number.

66639268943 is a deficient number, since it is larger than the sum of its proper divisors (6876472993).

66639268943 is a wasteful number, since it uses less digits than its factorization.

66639268943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125026825.

The product of its digits is 60466176, while the sum is 62.

The spelling of 66639268943 in words is "sixty-six billion, six hundred thirty-nine million, two hundred sixty-eight thousand, nine hundred forty-three".