263363317166021 has 2 divisors, whose sum is σ = 263363317166022. Its totient is φ = 263363317166020.

The previous prime is 263363317165957. The next prime is 263363317166051. The reversal of 263363317166021 is 120661713363362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207571589949025 + 55791727216996 = 14407345^2 + 7469386^2 .

It is a cyclic number.

It is not a de Polignac number, because 263363317166021 - 2⁶ = 263363317165957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263363317166051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131681658583010 + 131681658583011.

It is an arithmetic number, because the mean of its divisors is an integer number (131681658583011).

Almost surely, 2^{263363317166021} is an apocalyptic number.

It is an amenable number.

263363317166021 is a deficient number, since it is larger than the sum of its proper divisors (1).

263363317166021 is an equidigital number, since it uses as much as digits as its factorization.

263363317166021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2939328, while the sum is 50.

The spelling of 263363317166021 in words is "two hundred sixty-three trillion, three hundred sixty-three billion, three hundred seventeen million, one hundred sixty-six thousand, twenty-one".