90559695689 has 2 divisors, whose sum is σ = 90559695690. Its totient is φ = 90559695688.

The previous prime is 90559695661. The next prime is 90559695727. The reversal of 90559695689 is 98659695509.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90096025600 + 463670089 = 300160^2 + 21533^2 .

It is a cyclic number.

It is not a de Polignac number, because 90559695689 - 2¹⁶ = 90559630153 is a prime.

It is not a weakly prime, because it can be changed into another prime (90559695389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45279847844 + 45279847845.

It is an arithmetic number, because the mean of its divisors is an integer number (45279847845).

Almost surely, 2^90559695689 is an apocalyptic number.

It is an amenable number.

90559695689 is a deficient number, since it is larger than the sum of its proper divisors (1).

90559695689 is an equidigital number, since it uses as much as digits as its factorization.

90559695689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 236196000, while the sum is 71.

The spelling of 90559695689 in words is "ninety billion, five hundred fifty-nine million, six hundred ninety-five thousand, six hundred eighty-nine".