261535050437237 has 2 divisors, whose sum is σ = 261535050437238. Its totient is φ = 261535050437236.

The previous prime is 261535050437231. The next prime is 261535050437261. The reversal of 261535050437237 is 732734050535162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166403137270756 + 95131913166481 = 12899734^2 + 9753559^2 .

It is a cyclic number.

It is not a de Polignac number, because 261535050437237 - 2¹⁸ = 261535050175093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261535050437231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130767525218618 + 130767525218619.

It is an arithmetic number, because the mean of its divisors is an integer number (130767525218619).

Almost surely, 2^{261535050437237} is an apocalyptic number.

It is an amenable number.

261535050437237 is a deficient number, since it is larger than the sum of its proper divisors (1).

261535050437237 is an equidigital number, since it uses as much as digits as its factorization.

261535050437237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876000, while the sum is 53.

The spelling of 261535050437237 in words is "two hundred sixty-one trillion, five hundred thirty-five billion, fifty million, four hundred thirty-seven thousand, two hundred thirty-seven".