66888407 has 2 divisors, whose sum is σ = 66888408. Its totient is φ = 66888406.

The previous prime is 66888377. The next prime is 66888433. The reversal of 66888407 is 70488866.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66888407 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66888457) 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, 33444203 + 33444204.

It is an arithmetic number, because the mean of its divisors is an integer number (33444204).

Almost surely, 2^66888407 is an apocalyptic number.

66888407 is a deficient number, since it is larger than the sum of its proper divisors (1).

66888407 is an equidigital number, since it uses as much as digits as its factorization.

66888407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 516096, while the sum is 47.

The square root of 66888407 is about 8178.5333037165. The cubic root of 66888407 is about 405.9291920325.

The spelling of 66888407 in words is "sixty-six million, eight hundred eighty-eight thousand, four hundred seven".