66878983 has 2 divisors, whose sum is σ = 66878984. Its totient is φ = 66878982.

The previous prime is 66878971. The next prime is 66879011. The reversal of 66878983 is 38987866.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66878983 is a prime.

It is a super-2 number, since 2×66878983² = 8945596734228578, which contains 22 as substring.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66878923) by changing a digit.

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 as a sum of consecutive naturals, namely, 33439491 + 33439492.

It is an arithmetic number, because the mean of its divisors is an integer number (33439492).

Almost surely, 2^66878983 is an apocalyptic number.

66878983 is a deficient number, since it is larger than the sum of its proper divisors (1).

66878983 is an equidigital number, since it uses as much as digits as its factorization.

66878983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3483648, while the sum is 55.

The square root of 66878983 is about 8177.9571409980. The cubic root of 66878983 is about 405.9101271623.

The spelling of 66878983 in words is "sixty-six million, eight hundred seventy-eight thousand, nine hundred eighty-three".