66719004997 has 2 divisors, whose sum is σ = 66719004998. Its totient is φ = 66719004996.

The previous prime is 66719004983. The next prime is 66719005007. The reversal of 66719004997 is 79940091766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39734043556 + 26984961441 = 199334^2 + 164271^2 .

It is a cyclic number.

It is not a de Polignac number, because 66719004997 - 2²³ = 66710616389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66719004917) 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, 33359502498 + 33359502499.

It is an arithmetic number, because the mean of its divisors is an integer number (33359502499).

Almost surely, 2^66719004997 is an apocalyptic number.

It is an amenable number.

66719004997 is a deficient number, since it is larger than the sum of its proper divisors (1).

66719004997 is an equidigital number, since it uses as much as digits as its factorization.

66719004997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5143824, while the sum is 58.

The spelling of 66719004997 in words is "sixty-six billion, seven hundred nineteen million, four thousand, nine hundred ninety-seven".