854803771517 has 2 divisors, whose sum is σ = 854803771518. Its totient is φ = 854803771516.

The previous prime is 854803771513. The next prime is 854803771537. The reversal of 854803771517 is 715177308458.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 495420307321 + 359383464196 = 703861^2 + 599486^2 .

It is a cyclic number.

It is not a de Polignac number, because 854803771517 - 2² = 854803771513 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (854803771513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427401885758 + 427401885759.

It is an arithmetic number, because the mean of its divisors is an integer number (427401885759).

Almost surely, 2^854803771517 is an apocalyptic number.

It is an amenable number.

854803771517 is a deficient number, since it is larger than the sum of its proper divisors (1).

854803771517 is an equidigital number, since it uses as much as digits as its factorization.

854803771517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6585600, while the sum is 56.

The spelling of 854803771517 in words is "eight hundred fifty-four billion, eight hundred three million, seven hundred seventy-one thousand, five hundred seventeen".