84671999917 has 2 divisors, whose sum is σ = 84671999918. Its totient is φ = 84671999916.

The previous prime is 84671999903. The next prime is 84671999921. The reversal of 84671999917 is 71999917648.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51720311241 + 32951688676 = 227421^2 + 181526^2 .

It is a cyclic number.

It is not a de Polignac number, because 84671999917 - 2²³ = 84663611309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84671999957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42335999958 + 42335999959.

It is an arithmetic number, because the mean of its divisors is an integer number (42335999959).

Almost surely, 2^84671999917 is an apocalyptic number.

It is an amenable number.

84671999917 is a deficient number, since it is larger than the sum of its proper divisors (1).

84671999917 is an equidigital number, since it uses as much as digits as its factorization.

84671999917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61725888, while the sum is 70.

The spelling of 84671999917 in words is "eighty-four billion, six hundred seventy-one million, nine hundred ninety-nine thousand, nine hundred seventeen".