66789630407 has 2 divisors, whose sum is σ = 66789630408. Its totient is φ = 66789630406.

The previous prime is 66789630389. The next prime is 66789630409. The reversal of 66789630407 is 70403698766.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66789630407 - 2⁸ = 66789630151 is a prime.

Together with 66789630409, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66789630409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33394815203 + 33394815204.

It is an arithmetic number, because the mean of its divisors is an integer number (33394815204).

Almost surely, 2^66789630407 is an apocalyptic number.

66789630407 is a deficient number, since it is larger than the sum of its proper divisors (1).

66789630407 is an equidigital number, since it uses as much as digits as its factorization.

66789630407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9144576, while the sum is 56.

The spelling of 66789630407 in words is "sixty-six billion, seven hundred eighty-nine million, six hundred thirty thousand, four hundred seven".