90681964133 has 2 divisors, whose sum is σ = 90681964134. Its totient is φ = 90681964132.

The previous prime is 90681964103. The next prime is 90681964193. The reversal of 90681964133 is 33146918609.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70938060964 + 19743903169 = 266342^2 + 140513^2 .

It is a cyclic number.

It is not a de Polignac number, because 90681964133 - 2²⁰ = 90680915557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90681964103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45340982066 + 45340982067.

It is an arithmetic number, because the mean of its divisors is an integer number (45340982067).

Almost surely, 2^90681964133 is an apocalyptic number.

It is an amenable number.

90681964133 is a deficient number, since it is larger than the sum of its proper divisors (1).

90681964133 is an equidigital number, since it uses as much as digits as its factorization.

90681964133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 839808, while the sum is 50.

The spelling of 90681964133 in words is "ninety billion, six hundred eighty-one million, nine hundred sixty-four thousand, one hundred thirty-three".