66717038447 has 2 divisors, whose sum is σ = 66717038448. Its totient is φ = 66717038446.

The previous prime is 66717038429. The next prime is 66717038459. The reversal of 66717038447 is 74483071766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66717038447 - 2⁶ = 66717038383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66717038417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33358519223 + 33358519224.

It is an arithmetic number, because the mean of its divisors is an integer number (33358519224).

Almost surely, 2^66717038447 is an apocalyptic number.

66717038447 is a deficient number, since it is larger than the sum of its proper divisors (1).

66717038447 is an equidigital number, since it uses as much as digits as its factorization.

66717038447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4741632, while the sum is 53.

The spelling of 66717038447 in words is "sixty-six billion, seven hundred seventeen million, thirty-eight thousand, four hundred forty-seven".