263491462081 has 2 divisors, whose sum is σ = 263491462082. Its totient is φ = 263491462080.

The previous prime is 263491462021. The next prime is 263491462093. The reversal of 263491462081 is 180264194362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141288781456 + 122202680625 = 375884^2 + 349575^2 .

It is a cyclic number.

It is not a de Polignac number, because 263491462081 - 2²⁵ = 263457907649 is a prime.

It is a super-2 number, since 2×263491462081² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (263491462001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131745731040 + 131745731041.

It is an arithmetic number, because the mean of its divisors is an integer number (131745731041).

Almost surely, 2^263491462081 is an apocalyptic number.

It is an amenable number.

263491462081 is a deficient number, since it is larger than the sum of its proper divisors (1).

263491462081 is an equidigital number, since it uses as much as digits as its factorization.

263491462081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 497664, while the sum is 46.

The spelling of 263491462081 in words is "two hundred sixty-three billion, four hundred ninety-one million, four hundred sixty-two thousand, eighty-one".