66700523 has 2 divisors, whose sum is σ = 66700524. Its totient is φ = 66700522.

The previous prime is 66700519. The next prime is 66700541. The reversal of 66700523 is 32500766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66700523 - 2² = 66700519 is a prime.

It is not a weakly prime, because it can be changed into another prime (66700573) 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, 33350261 + 33350262.

It is an arithmetic number, because the mean of its divisors is an integer number (33350262).

Almost surely, 2^66700523 is an apocalyptic number.

66700523 is a deficient number, since it is larger than the sum of its proper divisors (1).

66700523 is an equidigital number, since it uses as much as digits as its factorization.

66700523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 29.

The square root of 66700523 is about 8167.0388146500. The cubic root of 66700523 is about 405.5487617747.

The spelling of 66700523 in words is "sixty-six million, seven hundred thousand, five hundred twenty-three".