66522619 has 2 divisors, whose sum is σ = 66522620. Its totient is φ = 66522618.

The previous prime is 66522611. The next prime is 66522713. The reversal of 66522619 is 91622566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66522619 - 2³ = 66522611 is a prime.

It is a super-2 number, since 2×66522619² = 8850517677238322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66522611) 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, 33261309 + 33261310.

It is an arithmetic number, because the mean of its divisors is an integer number (33261310).

Almost surely, 2^66522619 is an apocalyptic number.

66522619 is a deficient number, since it is larger than the sum of its proper divisors (1).

66522619 is an equidigital number, since it uses as much as digits as its factorization.

66522619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 37.

The square root of 66522619 is about 8156.1399571121. The cubic root of 66522619 is about 405.1878801101.

The spelling of 66522619 in words is "sixty-six million, five hundred twenty-two thousand, six hundred nineteen".