66782123 has 2 divisors, whose sum is σ = 66782124. Its totient is φ = 66782122.

The previous prime is 66782119. The next prime is 66782143. The reversal of 66782123 is 32128766.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66782123 - 2² = 66782119 is a prime.

It is not a weakly prime, because it can be changed into another prime (66782113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33391061 + 33391062.

It is an arithmetic number, because the mean of its divisors is an integer number (33391062).

Almost surely, 2^66782123 is an apocalyptic number.

66782123 is a deficient number, since it is larger than the sum of its proper divisors (1).

66782123 is an equidigital number, since it uses as much as digits as its factorization.

66782123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 35.

The square root of 66782123 is about 8172.0329783965. The cubic root of 66782123 is about 405.7140742872.

The spelling of 66782123 in words is "sixty-six million, seven hundred eighty-two thousand, one hundred twenty-three".