53165055221 has 2 divisors, whose sum is σ = 53165055222. Its totient is φ = 53165055220.

The previous prime is 53165055193. The next prime is 53165055227. The reversal of 53165055221 is 12255056135.

53165055221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48450172996 + 4714882225 = 220114^2 + 68665^2 .

It is a cyclic number.

It is not a de Polignac number, because 53165055221 - 2¹⁰ = 53165054197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53165055227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26582527610 + 26582527611.

It is an arithmetic number, because the mean of its divisors is an integer number (26582527611).

Almost surely, 2^53165055221 is an apocalyptic number.

It is an amenable number.

53165055221 is a deficient number, since it is larger than the sum of its proper divisors (1).

53165055221 is an equidigital number, since it uses as much as digits as its factorization.

53165055221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45000, while the sum is 35.

The spelling of 53165055221 in words is "fifty-three billion, one hundred sixty-five million, fifty-five thousand, two hundred twenty-one".