66780383 has 4 divisors (see below), whose sum is σ = 70295160. Its totient is φ = 63265608.

The previous prime is 66780379. The next prime is 66780443. The reversal of 66780383 is 38308766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38308766 = 2 ⋅19154383.

It is a cyclic number.

It is not a de Polignac number, because 66780383 - 2² = 66780379 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66780383.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66780353) 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, 1757360 + ... + 1757397.

It is an arithmetic number, because the mean of its divisors is an integer number (17573790).

Almost surely, 2^66780383 is an apocalyptic number.

66780383 is a deficient number, since it is larger than the sum of its proper divisors (3514777).

66780383 is a wasteful number, since it uses less digits than its factorization.

66780383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3514776.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 66780383 is about 8171.9265170460. The cubic root of 66780383 is about 405.7105506465.

The spelling of 66780383 in words is "sixty-six million, seven hundred eighty thousand, three hundred eighty-three".