66640883 has 2 divisors, whose sum is σ = 66640884. Its totient is φ = 66640882.

The previous prime is 66640859. The next prime is 66640943. The reversal of 66640883 is 38804666.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66640883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66640883.

It is not a weakly prime, because it can be changed into another prime (66643883) 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 as a sum of consecutive naturals, namely, 33320441 + 33320442.

It is an arithmetic number, because the mean of its divisors is an integer number (33320442).

Almost surely, 2^66640883 is an apocalyptic number.

66640883 is a deficient number, since it is larger than the sum of its proper divisors (1).

66640883 is an equidigital number, since it uses as much as digits as its factorization.

66640883 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 66640883 is about 8163.3867359081. The cubic root of 66640883 is about 405.4278524748.

The spelling of 66640883 in words is "sixty-six million, six hundred forty thousand, eight hundred eighty-three".