263221323270197 has 2 divisors, whose sum is σ = 263221323270198. Its totient is φ = 263221323270196.

The previous prime is 263221323270083. The next prime is 263221323270293. The reversal of 263221323270197 is 791072323122362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 244163156769841 + 19058166500356 = 15625721^2 + 4365566^2 .

It is a cyclic number.

It is not a de Polignac number, because 263221323270197 - 2¹² = 263221323266101 is a prime.

It is a super-2 number, since 2×263221323270197² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263221323270397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131610661635098 + 131610661635099.

It is an arithmetic number, because the mean of its divisors is an integer number (131610661635099).

Almost surely, 2^{263221323270197} is an apocalyptic number.

It is an amenable number.

263221323270197 is a deficient number, since it is larger than the sum of its proper divisors (1).

263221323270197 is an equidigital number, since it uses as much as digits as its factorization.

263221323270197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2286144, while the sum is 50.

The spelling of 263221323270197 in words is "two hundred sixty-three trillion, two hundred twenty-one billion, three hundred twenty-three million, two hundred seventy thousand, one hundred ninety-seven".