84331578689 has 2 divisors, whose sum is σ = 84331578690. Its totient is φ = 84331578688.

The previous prime is 84331578677. The next prime is 84331578697. The reversal of 84331578689 is 98687513348.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83347690000 + 983888689 = 288700^2 + 31367^2 .

It is a cyclic number.

It is not a de Polignac number, because 84331578689 - 2¹⁶ = 84331513153 is a prime.

It is a super-2 number, since 2×84331578689² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (84331578619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42165789344 + 42165789345.

It is an arithmetic number, because the mean of its divisors is an integer number (42165789345).

Almost surely, 2^84331578689 is an apocalyptic number.

It is an amenable number.

84331578689 is a deficient number, since it is larger than the sum of its proper divisors (1).

84331578689 is an equidigital number, since it uses as much as digits as its factorization.

84331578689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34836480, while the sum is 62.

The spelling of 84331578689 in words is "eighty-four billion, three hundred thirty-one million, five hundred seventy-eight thousand, six hundred eighty-nine".