9992521165391 has 2 divisors, whose sum is σ = 9992521165392. Its totient is φ = 9992521165390.

The previous prime is 9992521165351. The next prime is 9992521165399. The reversal of 9992521165391 is 1935611252999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9992521165391 - 2²⁶ = 9992454056527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9992521165399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4996260582695 + 4996260582696.

It is an arithmetic number, because the mean of its divisors is an integer number (4996260582696).

Almost surely, 2^{9992521165391} is an apocalyptic number.

9992521165391 is a deficient number, since it is larger than the sum of its proper divisors (1).

9992521165391 is an equidigital number, since it uses as much as digits as its factorization.

9992521165391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11809800, while the sum is 62.

The spelling of 9992521165391 in words is "nine trillion, nine hundred ninety-two billion, five hundred twenty-one million, one hundred sixty-five thousand, three hundred ninety-one".