261265082237 has 2 divisors, whose sum is σ = 261265082238. Its totient is φ = 261265082236.

The previous prime is 261265082227. The next prime is 261265082297. The reversal of 261265082237 is 732280562162.

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., 248142463321 + 13122618916 = 498139^2 + 114554^2 .

It is a cyclic number.

It is not a de Polignac number, because 261265082237 - 2²² = 261260887933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261265082227) 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, 130632541118 + 130632541119.

It is an arithmetic number, because the mean of its divisors is an integer number (130632541119).

Almost surely, 2^261265082237 is an apocalyptic number.

It is an amenable number.

261265082237 is a deficient number, since it is larger than the sum of its proper divisors (1).

261265082237 is an equidigital number, since it uses as much as digits as its factorization.

261265082237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 261265082237 in words is "two hundred sixty-one billion, two hundred sixty-five million, eighty-two thousand, two hundred thirty-seven".