84663543989 has 2 divisors, whose sum is σ = 84663543990. Its totient is φ = 84663543988.

The previous prime is 84663543983. The next prime is 84663544061. The reversal of 84663543989 is 98934536648.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67305481489 + 17358062500 = 259433^2 + 131750^2 .

It is a cyclic number.

It is not a de Polignac number, because 84663543989 - 2²⁴ = 84646766773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84663543983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42331771994 + 42331771995.

It is an arithmetic number, because the mean of its divisors is an integer number (42331771995).

Almost surely, 2^84663543989 is an apocalyptic number.

It is an amenable number.

84663543989 is a deficient number, since it is larger than the sum of its proper divisors (1).

84663543989 is an equidigital number, since it uses as much as digits as its factorization.

84663543989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 134369280, while the sum is 65.

The spelling of 84663543989 in words is "eighty-four billion, six hundred sixty-three million, five hundred forty-three thousand, nine hundred eighty-nine".