261635366053 has 2 divisors, whose sum is σ = 261635366054. Its totient is φ = 261635366052.

The previous prime is 261635366039. The next prime is 261635366087. The reversal of 261635366053 is 350663536162.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189501761124 + 72133604929 = 435318^2 + 268577^2 .

It is a cyclic number.

It is not a de Polignac number, because 261635366053 - 2²¹ = 261633268901 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261635365994 and 261635366012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261635366093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130817683026 + 130817683027.

It is an arithmetic number, because the mean of its divisors is an integer number (130817683027).

Almost surely, 2^261635366053 is an apocalyptic number.

It is an amenable number.

261635366053 is a deficient number, since it is larger than the sum of its proper divisors (1).

261635366053 is an equidigital number, since it uses as much as digits as its factorization.

261635366053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1749600, while the sum is 46.

The spelling of 261635366053 in words is "two hundred sixty-one billion, six hundred thirty-five million, three hundred sixty-six thousand, fifty-three".