66636407 has 2 divisors, whose sum is σ = 66636408. Its totient is φ = 66636406.

The previous prime is 66636397. The next prime is 66636419. The reversal of 66636407 is 70463666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66636407 - 2⁶ = 66636343 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 (66636457) 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, 33318203 + 33318204.

It is an arithmetic number, because the mean of its divisors is an integer number (33318204).

Almost surely, 2^66636407 is an apocalyptic number.

66636407 is a deficient number, since it is larger than the sum of its proper divisors (1).

66636407 is an equidigital number, since it uses as much as digits as its factorization.

66636407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 38.

The square root of 66636407 is about 8163.1125803826. The cubic root of 66636407 is about 405.4187752856.

It can be divided in two parts, 666 and 36407, that added together give a palindrome (37073).

The spelling of 66636407 in words is "sixty-six million, six hundred thirty-six thousand, four hundred seven".