66928579 has 2 divisors, whose sum is σ = 66928580. Its totient is φ = 66928578.

The previous prime is 66928577. The next prime is 66928591. The reversal of 66928579 is 97582966.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66928579 - 2¹ = 66928577 is a prime.

Together with 66928577, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66928573) 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, 33464289 + 33464290.

It is an arithmetic number, because the mean of its divisors is an integer number (33464290).

Almost surely, 2^66928579 is an apocalyptic number.

66928579 is a deficient number, since it is larger than the sum of its proper divisors (1).

66928579 is an equidigital number, since it uses as much as digits as its factorization.

66928579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 52.

The square root of 66928579 is about 8180.9888766579. The cubic root of 66928579 is about 406.0104404120.

The spelling of 66928579 in words is "sixty-six million, nine hundred twenty-eight thousand, five hundred seventy-nine".