806610811012121 has 2 divisors, whose sum is σ = 806610811012122. Its totient is φ = 806610811012120.

The previous prime is 806610811012091. The next prime is 806610811012141. The reversal of 806610811012121 is 121210118016608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 550856671952896 + 255754139059225 = 23470336^2 + 15992315^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-806610811012121 is a prime.

It is not a weakly prime, because it can be changed into another prime (806610811012141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403305405506060 + 403305405506061.

It is an arithmetic number, because the mean of its divisors is an integer number (403305405506061).

Almost surely, 2^{806610811012121} is an apocalyptic number.

It is an amenable number.

806610811012121 is a deficient number, since it is larger than the sum of its proper divisors (1).

806610811012121 is an equidigital number, since it uses as much as digits as its factorization.

806610811012121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 38.

Adding to 806610811012121 its reverse (121210118016608), we get a palindrome (927820929028729).

The spelling of 806610811012121 in words is "eight hundred six trillion, six hundred ten billion, eight hundred eleven million, twelve thousand, one hundred twenty-one".