84205045261 has 2 divisors, whose sum is σ = 84205045262. Its totient is φ = 84205045260.

The previous prime is 84205045237. The next prime is 84205045297. The reversal of 84205045261 is 16254050248.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81071172900 + 3133872361 = 284730^2 + 55981^2 .

It is a cyclic number.

It is not a de Polignac number, because 84205045261 - 2²⁹ = 83668174349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84205045261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84205045061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42102522630 + 42102522631.

It is an arithmetic number, because the mean of its divisors is an integer number (42102522631).

Almost surely, 2^84205045261 is an apocalyptic number.

It is an amenable number.

84205045261 is a deficient number, since it is larger than the sum of its proper divisors (1).

84205045261 is an equidigital number, since it uses as much as digits as its factorization.

84205045261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76800, while the sum is 37.

The spelling of 84205045261 in words is "eighty-four billion, two hundred five million, forty-five thousand, two hundred sixty-one".