66943255 has 4 divisors (see below), whose sum is σ = 80331912. Its totient is φ = 53554600.

The previous prime is 66943243. The next prime is 66943259. The reversal of 66943255 is 55234966.

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

It is not a de Polignac number, because 66943255 - 2¹⁷ = 66812183 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66943259) 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, 6694321 + ... + 6694330.

It is an arithmetic number, because the mean of its divisors is an integer number (20082978).

Almost surely, 2^66943255 is an apocalyptic number.

66943255 is a deficient number, since it is larger than the sum of its proper divisors (13388657).

66943255 is a wasteful number, since it uses less digits than its factorization.

66943255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13388656.

The product of its digits is 194400, while the sum is 40.

The square root of 66943255 is about 8181.8857850742. The cubic root of 66943255 is about 406.0401146997.

The spelling of 66943255 in words is "sixty-six million, nine hundred forty-three thousand, two hundred fifty-five".