84580779289 has 2 divisors, whose sum is σ = 84580779290. Its totient is φ = 84580779288.

The previous prime is 84580779277. The next prime is 84580779293. The reversal of 84580779289 is 98297708548.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78283563264 + 6297216025 = 279792^2 + 79355^2 .

It is a cyclic number.

It is not a de Polignac number, because 84580779289 - 2¹¹ = 84580777241 is a prime.

It is not a weakly prime, because it can be changed into another prime (84580779589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42290389644 + 42290389645.

It is an arithmetic number, because the mean of its divisors is an integer number (42290389645).

Almost surely, 2^84580779289 is an apocalyptic number.

It is an amenable number.

84580779289 is a deficient number, since it is larger than the sum of its proper divisors (1).

84580779289 is an equidigital number, since it uses as much as digits as its factorization.

84580779289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81285120, while the sum is 67.

The spelling of 84580779289 in words is "eighty-four billion, five hundred eighty million, seven hundred seventy-nine thousand, two hundred eighty-nine".