66725899 has 2 divisors, whose sum is σ = 66725900. Its totient is φ = 66725898.

The previous prime is 66725863. The next prime is 66725951. The reversal of 66725899 is 99852766.

It is a happy number.

66725899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (66725951) can be obtained adding 66725899 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66725899 - 2⁹ = 66725387 is a prime.

It is not a weakly prime, because it can be changed into another prime (63725899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33362949 + 33362950.

It is an arithmetic number, because the mean of its divisors is an integer number (33362950).

Almost surely, 2^66725899 is an apocalyptic number.

66725899 is a deficient number, since it is larger than the sum of its proper divisors (1).

66725899 is an equidigital number, since it uses as much as digits as its factorization.

66725899 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 66725899 is about 8168.5922287748. The cubic root of 66725899 is about 405.6001851624.

The spelling of 66725899 in words is "sixty-six million, seven hundred twenty-five thousand, eight hundred ninety-nine".