261665044733353 has 2 divisors, whose sum is σ = 261665044733354. Its totient is φ = 261665044733352.

The previous prime is 261665044733347. The next prime is 261665044733359. The reversal of 261665044733353 is 353337440566162.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (261665044733347) and next prime (261665044733359).

It can be written as a sum of positive squares in only one way, i.e., 225974492872704 + 35690551860649 = 15032448^2 + 5974157^2 .

It is a cyclic number.

It is not a de Polignac number, because 261665044733353 - 2⁵ = 261665044733321 is a prime.

It is not a weakly prime, because it can be changed into another prime (261665044733359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130832522366676 + 130832522366677.

It is an arithmetic number, because the mean of its divisors is an integer number (130832522366677).

Almost surely, 2^{261665044733353} is an apocalyptic number.

It is an amenable number.

261665044733353 is a deficient number, since it is larger than the sum of its proper divisors (1).

261665044733353 is an equidigital number, since it uses as much as digits as its factorization.

261665044733353 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97977600, while the sum is 58.

The spelling of 261665044733353 in words is "two hundred sixty-one trillion, six hundred sixty-five billion, forty-four million, seven hundred thirty-three thousand, three hundred fifty-three".