85461216389 has 2 divisors, whose sum is σ = 85461216390. Its totient is φ = 85461216388.

The previous prime is 85461216353. The next prime is 85461216469. The reversal of 85461216389 is 98361216458.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83626807489 + 1834408900 = 289183^2 + 42830^2 .

It is a cyclic number.

It is not a de Polignac number, because 85461216389 - 2⁸ = 85461216133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85461216389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85461216349) 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, 42730608194 + 42730608195.

It is an arithmetic number, because the mean of its divisors is an integer number (42730608195).

Almost surely, 2^85461216389 is an apocalyptic number.

It is an amenable number.

85461216389 is a deficient number, since it is larger than the sum of its proper divisors (1).

85461216389 is an equidigital number, since it uses as much as digits as its factorization.

85461216389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2488320, while the sum is 53.

The spelling of 85461216389 in words is "eighty-five billion, four hundred sixty-one million, two hundred sixteen thousand, three hundred eighty-nine".