90643085641 has 2 divisors, whose sum is σ = 90643085642. Its totient is φ = 90643085640.

The previous prime is 90643085591. The next prime is 90643085651. The reversal of 90643085641 is 14658034609.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84102320016 + 6540765625 = 290004^2 + 80875^2 .

It is an emirp because it is prime and its reverse (14658034609) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90643085641 - 2¹⁵ = 90643052873 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90643085591 and 90643085600.

It is not a weakly prime, because it can be changed into another prime (90643085651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45321542820 + 45321542821.

It is an arithmetic number, because the mean of its divisors is an integer number (45321542821).

Almost surely, 2^90643085641 is an apocalyptic number.

It is an amenable number.

90643085641 is a deficient number, since it is larger than the sum of its proper divisors (1).

90643085641 is an equidigital number, since it uses as much as digits as its factorization.

90643085641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 622080, while the sum is 46.

The spelling of 90643085641 in words is "ninety billion, six hundred forty-three million, eighty-five thousand, six hundred forty-one".