89845696817861 has 2 divisors, whose sum is σ = 89845696817862. Its totient is φ = 89845696817860.

The previous prime is 89845696817801. The next prime is 89845696817873. The reversal of 89845696817861 is 16871869654898.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45506492222500 + 44339204595361 = 6745850^2 + 6658769^2 .

It is a cyclic number.

It is not a de Polignac number, because 89845696817861 - 2⁶ = 89845696817797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89845696817801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44922848408930 + 44922848408931.

It is an arithmetic number, because the mean of its divisors is an integer number (44922848408931).

Almost surely, 2^{89845696817861} is an apocalyptic number.

It is an amenable number.

89845696817861 is a deficient number, since it is larger than the sum of its proper divisors (1).

89845696817861 is an equidigital number, since it uses as much as digits as its factorization.

89845696817861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10032906240, while the sum is 86.

The spelling of 89845696817861 in words is "eighty-nine trillion, eight hundred forty-five billion, six hundred ninety-six million, eight hundred seventeen thousand, eight hundred sixty-one".