261457330702261 has 2 divisors, whose sum is σ = 261457330702262. Its totient is φ = 261457330702260.

The previous prime is 261457330702153. The next prime is 261457330702319. The reversal of 261457330702261 is 162207033754162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 242085281628100 + 19372049074161 = 15559090^2 + 4401369^2 .

It is a cyclic number.

It is not a de Polignac number, because 261457330702261 - 2²⁹ = 261456793831349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261457330742261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130728665351130 + 130728665351131.

It is an arithmetic number, because the mean of its divisors is an integer number (130728665351131).

Almost surely, 2^{261457330702261} is an apocalyptic number.

It is an amenable number.

261457330702261 is a deficient number, since it is larger than the sum of its proper divisors (1).

261457330702261 is an equidigital number, since it uses as much as digits as its factorization.

261457330702261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2540160, while the sum is 49.

The spelling of 261457330702261 in words is "two hundred sixty-one trillion, four hundred fifty-seven billion, three hundred thirty million, seven hundred two thousand, two hundred sixty-one".