66625523 has 2 divisors, whose sum is σ = 66625524. Its totient is φ = 66625522.

The previous prime is 66625513. The next prime is 66625543. The reversal of 66625523 is 32552666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66625523 - 2⁶ = 66625459 is a prime.

It is not a weakly prime, because it can be changed into another prime (66625513) 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, 33312761 + 33312762.

It is an arithmetic number, because the mean of its divisors is an integer number (33312762).

Almost surely, 2^66625523 is an apocalyptic number.

66625523 is a deficient number, since it is larger than the sum of its proper divisors (1).

66625523 is an equidigital number, since it uses as much as digits as its factorization.

66625523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 35.

The square root of 66625523 is about 8162.4458956859. The cubic root of 66625523 is about 405.3967011752.

The spelling of 66625523 in words is "sixty-six million, six hundred twenty-five thousand, five hundred twenty-three".