66783455 has 8 divisors (see below), whose sum is σ = 82725504. Its totient is φ = 51703200.

The previous prime is 66783443. The next prime is 66783473. The reversal of 66783455 is 55438766.

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

It is not a de Polignac number, because 66783455 - 2²⁴ = 50006239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215276 + ... + 215585.

It is an arithmetic number, because the mean of its divisors is an integer number (10340688).

Almost surely, 2^66783455 is an apocalyptic number.

66783455 is a deficient number, since it is larger than the sum of its proper divisors (15942049).

66783455 is a wasteful number, since it uses less digits than its factorization.

66783455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430897.

The product of its digits is 604800, while the sum is 44.

The square root of 66783455 is about 8172.1144754586. The cubic root of 66783455 is about 405.7167716535.

Adding to 66783455 its reverse (55438766), we get a palindrome (122222221).

The spelling of 66783455 in words is "sixty-six million, seven hundred eighty-three thousand, four hundred fifty-five".