66455939 has 8 divisors (see below), whose sum is σ = 76313280. Its totient is φ = 57234600.

The previous prime is 66455933. The next prime is 66455951. The reversal of 66455939 is 93955466.

66455939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66455939 - 2¹⁶ = 66390403 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66455893 and 66455902.

It is not an unprimeable number, because it can be changed into a prime (66455933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158777 + ... + 159194.

It is an arithmetic number, because the mean of its divisors is an integer number (9539160).

Almost surely, 2^66455939 is an apocalyptic number.

66455939 is a deficient number, since it is larger than the sum of its proper divisors (9857341).

66455939 is a wasteful number, since it uses less digits than its factorization.

66455939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318001.

The product of its digits is 874800, while the sum is 47.

The square root of 66455939 is about 8152.0512142650. The cubic root of 66455939 is about 405.0524526892.

The spelling of 66455939 in words is "sixty-six million, four hundred fifty-five thousand, nine hundred thirty-nine".