230091666821 has 2 divisors, whose sum is σ = 230091666822. Its totient is φ = 230091666820.

The previous prime is 230091666787. The next prime is 230091666853. The reversal of 230091666821 is 128666190032.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137362890625 + 92728776196 = 370625^2 + 304514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-230091666821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (230091666881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115045833410 + 115045833411.

It is an arithmetic number, because the mean of its divisors is an integer number (115045833411).

Almost surely, 2^230091666821 is an apocalyptic number.

It is an amenable number.

230091666821 is a deficient number, since it is larger than the sum of its proper divisors (1).

230091666821 is an equidigital number, since it uses as much as digits as its factorization.

230091666821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 44.

The spelling of 230091666821 in words is "two hundred thirty billion, ninety-one million, six hundred sixty-six thousand, eight hundred twenty-one".