84171517907 has 2 divisors, whose sum is σ = 84171517908. Its totient is φ = 84171517906.

The previous prime is 84171517849. The next prime is 84171517933. The reversal of 84171517907 is 70971517148.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84171517907 - 2²⁸ = 83903082451 is a prime.

It is not a weakly prime, because it can be changed into another prime (84171547907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42085758953 + 42085758954.

It is an arithmetic number, because the mean of its divisors is an integer number (42085758954).

Almost surely, 2^84171517907 is an apocalyptic number.

84171517907 is a deficient number, since it is larger than the sum of its proper divisors (1).

84171517907 is an equidigital number, since it uses as much as digits as its factorization.

84171517907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 493920, while the sum is 50.

The spelling of 84171517907 in words is "eighty-four billion, one hundred seventy-one million, five hundred seventeen thousand, nine hundred seven".