84117817078247 has 2 divisors, whose sum is σ = 84117817078248. Its totient is φ = 84117817078246.

The previous prime is 84117817078231. The next prime is 84117817078271. The reversal of 84117817078247 is 74287071871148.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84117817078247 - 2⁴ = 84117817078231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84117817078297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42058908539123 + 42058908539124.

It is an arithmetic number, because the mean of its divisors is an integer number (42058908539124).

Almost surely, 2^{84117817078247} is an apocalyptic number.

84117817078247 is a deficient number, since it is larger than the sum of its proper divisors (1).

84117817078247 is an equidigital number, since it uses as much as digits as its factorization.

84117817078247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39337984, while the sum is 65.

The spelling of 84117817078247 in words is "eighty-four trillion, one hundred seventeen billion, eight hundred seventeen million, seventy-eight thousand, two hundred forty-seven".