66704787847 has 2 divisors, whose sum is σ = 66704787848. Its totient is φ = 66704787846.

The previous prime is 66704787829. The next prime is 66704787889. The reversal of 66704787847 is 74878740766.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66704787847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66704787827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33352393923 + 33352393924.

It is an arithmetic number, because the mean of its divisors is an integer number (33352393924).

Almost surely, 2^66704787847 is an apocalyptic number.

66704787847 is a deficient number, since it is larger than the sum of its proper divisors (1).

66704787847 is an equidigital number, since it uses as much as digits as its factorization.

66704787847 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 88510464, while the sum is 64.

The spelling of 66704787847 in words is "sixty-six billion, seven hundred four million, seven hundred eighty-seven thousand, eight hundred forty-seven".