53521166664197 has 2 divisors, whose sum is σ = 53521166664198. Its totient is φ = 53521166664196.

The previous prime is 53521166664127. The next prime is 53521166664221. The reversal of 53521166664197 is 79146666112535.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53518969023556 + 2197640641 = 7315666^2 + 46879^2 .

It is a cyclic number.

It is not a de Polignac number, because 53521166664197 - 2³⁸ = 53246288757253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53521166664127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26760583332098 + 26760583332099.

It is an arithmetic number, because the mean of its divisors is an integer number (26760583332099).

Almost surely, 2^{53521166664197} is an apocalyptic number.

It is an amenable number.

53521166664197 is a deficient number, since it is larger than the sum of its proper divisors (1).

53521166664197 is an equidigital number, since it uses as much as digits as its factorization.

53521166664197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48988800, while the sum is 62.

The spelling of 53521166664197 in words is "fifty-three trillion, five hundred twenty-one billion, one hundred sixty-six million, six hundred sixty-four thousand, one hundred ninety-seven".