84447995917 has 2 divisors, whose sum is σ = 84447995918. Its totient is φ = 84447995916.

The previous prime is 84447995857. The next prime is 84447995927. The reversal of 84447995917 is 71959974448.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84157429801 + 290566116 = 290099^2 + 17046^2 .

It is a cyclic number.

It is not a de Polignac number, because 84447995917 - 2²³ = 84439607309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84447995927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42223997958 + 42223997959.

It is an arithmetic number, because the mean of its divisors is an integer number (42223997959).

Almost surely, 2^84447995917 is an apocalyptic number.

It is an amenable number.

84447995917 is a deficient number, since it is larger than the sum of its proper divisors (1).

84447995917 is an equidigital number, since it uses as much as digits as its factorization.

84447995917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 91445760, while the sum is 67.

The spelling of 84447995917 in words is "eighty-four billion, four hundred forty-seven million, nine hundred ninety-five thousand, nine hundred seventeen".