90281618633081 has 2 divisors, whose sum is σ = 90281618633082. Its totient is φ = 90281618633080.

The previous prime is 90281618633069. The next prime is 90281618633099. The reversal of 90281618633081 is 18033681618209.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90257904173056 + 23714460025 = 9500416^2 + 153995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90281618633081 is a prime.

It is a super-2 number, since 2×90281618633081² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90281618633281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45140809316540 + 45140809316541.

It is an arithmetic number, because the mean of its divisors is an integer number (45140809316541).

Almost surely, 2^{90281618633081} is an apocalyptic number.

It is an amenable number.

90281618633081 is a deficient number, since it is larger than the sum of its proper divisors (1).

90281618633081 is an equidigital number, since it uses as much as digits as its factorization.

90281618633081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2985984, while the sum is 56.

The spelling of 90281618633081 in words is "ninety trillion, two hundred eighty-one billion, six hundred eighteen million, six hundred thirty-three thousand, eighty-one".