91933093661 has 2 divisors, whose sum is σ = 91933093662. Its totient is φ = 91933093660.

The previous prime is 91933093649. The next prime is 91933093687. The reversal of 91933093661 is 16639033919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72945907225 + 18987186436 = 270085^2 + 137794^2 .

It is a cyclic number.

It is not a de Polignac number, because 91933093661 - 2³⁴ = 74753224477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91933093061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45966546830 + 45966546831.

It is an arithmetic number, because the mean of its divisors is an integer number (45966546831).

Almost surely, 2^91933093661 is an apocalyptic number.

It is an amenable number.

91933093661 is a deficient number, since it is larger than the sum of its proper divisors (1).

91933093661 is an equidigital number, since it uses as much as digits as its factorization.

91933093661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 708588, while the sum is 50.

The spelling of 91933093661 in words is "ninety-one billion, nine hundred thirty-three million, ninety-three thousand, six hundred sixty-one".