66883979 has 2 divisors, whose sum is σ = 66883980. Its totient is φ = 66883978.

The previous prime is 66883951. The next prime is 66883991. The reversal of 66883979 is 97938866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66883979 - 2⁸ = 66883723 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66883939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33441989 + 33441990.

It is an arithmetic number, because the mean of its divisors is an integer number (33441990).

Almost surely, 2^66883979 is an apocalyptic number.

66883979 is a deficient number, since it is larger than the sum of its proper divisors (1).

66883979 is an equidigital number, since it uses as much as digits as its factorization.

66883979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3919104, while the sum is 56.

The square root of 66883979 is about 8178.2625905506. The cubic root of 66883979 is about 405.9202343560.

The spelling of 66883979 in words is "sixty-six million, eight hundred eighty-three thousand, nine hundred seventy-nine".