90953533661 has 2 divisors, whose sum is σ = 90953533662. Its totient is φ = 90953533660.

The previous prime is 90953533621. The next prime is 90953533669. The reversal of 90953533661 is 16633535909.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65295580900 + 25657952761 = 255530^2 + 160181^2 .

It is an emirp because it is prime and its reverse (16633535909) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90953533661 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90953533669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45476766830 + 45476766831.

It is an arithmetic number, because the mean of its divisors is an integer number (45476766831).

Almost surely, 2^90953533661 is an apocalyptic number.

It is an amenable number.

90953533661 is a deficient number, since it is larger than the sum of its proper divisors (1).

90953533661 is an equidigital number, since it uses as much as digits as its factorization.

90953533661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1968300, while the sum is 50.

The spelling of 90953533661 in words is "ninety billion, nine hundred fifty-three million, five hundred thirty-three thousand, six hundred sixty-one".