7808125428121 has 2 divisors, whose sum is σ = 7808125428122. Its totient is φ = 7808125428120.

The previous prime is 7808125428091. The next prime is 7808125428193. The reversal of 7808125428121 is 1218245218087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6143086175625 + 1665039252496 = 2478525^2 + 1290364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7808125428121 is a prime.

It is not a weakly prime, because it can be changed into another prime (7808125422121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3904062714060 + 3904062714061.

It is an arithmetic number, because the mean of its divisors is an integer number (3904062714061).

Almost surely, 2^{7808125428121} is an apocalyptic number.

It is an amenable number.

7808125428121 is a deficient number, since it is larger than the sum of its proper divisors (1).

7808125428121 is an equidigital number, since it uses as much as digits as its factorization.

7808125428121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 573440, while the sum is 49.

The spelling of 7808125428121 in words is "seven trillion, eight hundred eight billion, one hundred twenty-five million, four hundred twenty-eight thousand, one hundred twenty-one".