66782975 has 24 divisors (see below), whose sum is σ = 94993920. Its totient is φ = 45623520.

The previous prime is 66782971. The next prime is 66782993. The reversal of 66782975 is 57928766.

It is not a de Polignac number, because 66782975 - 2² = 66782971 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66782971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62294 + ... + 63356.

It is an arithmetic number, because the mean of its divisors is an integer number (3958080).

Almost surely, 2^66782975 is an apocalyptic number.

66782975 is a deficient number, since it is larger than the sum of its proper divisors (28210945).

66782975 is a wasteful number, since it uses less digits than its factorization.

66782975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1439 (or 1434 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 50.

The square root of 66782975 is about 8172.0851072416. The cubic root of 66782975 is about 405.7157996337.

The spelling of 66782975 in words is "sixty-six million, seven hundred eighty-two thousand, nine hundred seventy-five".