263512572449261 has 2 divisors, whose sum is σ = 263512572449262. Its totient is φ = 263512572449260.

The previous prime is 263512572449213. The next prime is 263512572449327. The reversal of 263512572449261 is 162944275215362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 259177994188036 + 4334578261225 = 16099006^2 + 2081965^2 .

It is a cyclic number.

It is not a de Polignac number, because 263512572449261 - 2³⁰ = 263511498707437 is a prime.

It is a super-2 number, since 2×263512572449261² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 263512572449261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263512572449201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131756286224630 + 131756286224631.

It is an arithmetic number, because the mean of its divisors is an integer number (131756286224631).

Almost surely, 2^{263512572449261} is an apocalyptic number.

It is an amenable number.

263512572449261 is a deficient number, since it is larger than the sum of its proper divisors (1).

263512572449261 is an equidigital number, since it uses as much as digits as its factorization.

263512572449261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43545600, while the sum is 59.

The spelling of 263512572449261 in words is "two hundred sixty-three trillion, five hundred twelve billion, five hundred seventy-two million, four hundred forty-nine thousand, two hundred sixty-one".