261523002048611 has 2 divisors, whose sum is σ = 261523002048612. Its totient is φ = 261523002048610.

The previous prime is 261523002048593. The next prime is 261523002048743. The reversal of 261523002048611 is 116840200325162.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261523002048611 is a prime.

It is not a weakly prime, because it can be changed into another prime (261523002048211) 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, 130761501024305 + 130761501024306.

It is an arithmetic number, because the mean of its divisors is an integer number (130761501024306).

Almost surely, 2^{261523002048611} is an apocalyptic number.

261523002048611 is a deficient number, since it is larger than the sum of its proper divisors (1).

261523002048611 is an equidigital number, since it uses as much as digits as its factorization.

261523002048611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 261523002048611 in words is "two hundred sixty-one trillion, five hundred twenty-three billion, two million, forty-eight thousand, six hundred eleven".