90858574475989 has 2 divisors, whose sum is σ = 90858574475990. Its totient is φ = 90858574475988.

The previous prime is 90858574475987. The next prime is 90858574476029. The reversal of 90858574475989 is 98957447585809.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65397013532964 + 25461560943025 = 8086842^2 + 5045945^2 .

It is a cyclic number.

It is not a de Polignac number, because 90858574475989 - 2¹ = 90858574475987 is a prime.

Together with 90858574475987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90858574475987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45429287237994 + 45429287237995.

It is an arithmetic number, because the mean of its divisors is an integer number (45429287237995).

Almost surely, 2^{90858574475989} is an apocalyptic number.

It is an amenable number.

90858574475989 is a deficient number, since it is larger than the sum of its proper divisors (1).

90858574475989 is an equidigital number, since it uses as much as digits as its factorization.

90858574475989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36578304000, while the sum is 88.

The spelling of 90858574475989 in words is "ninety trillion, eight hundred fifty-eight billion, five hundred seventy-four million, four hundred seventy-five thousand, nine hundred eighty-nine".