90017074999981 has 2 divisors, whose sum is σ = 90017074999982. Its totient is φ = 90017074999980.

The previous prime is 90017074999979. The next prime is 90017075000053. The reversal of 90017074999981 is 18999947071009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88993469313225 + 1023605686756 = 9433635^2 + 1011734^2 .

It is an emirp because it is prime and its reverse (18999947071009) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90017074999981 - 2¹ = 90017074999979 is a prime.

It is a super-2 number, since 2×90017074999981² (a number of 29 digits) contains 22 as substring.

Together with 90017074999979, 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 (90017074999681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45008537499990 + 45008537499991.

It is an arithmetic number, because the mean of its divisors is an integer number (45008537499991).

Almost surely, 2^{90017074999981} is an apocalyptic number.

It is an amenable number.

90017074999981 is a deficient number, since it is larger than the sum of its proper divisors (1).

90017074999981 is an equidigital number, since it uses as much as digits as its factorization.

90017074999981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 92588832, while the sum is 73.

The spelling of 90017074999981 in words is "ninety trillion, seventeen billion, seventy-four million, nine hundred ninety-nine thousand, nine hundred eighty-one".