261708603680011 has 12 divisors (see below), whose sum is σ = 278029334642248. Its totient is φ = 246295780641792.

The previous prime is 261708603680003. The next prime is 261708603680039. The reversal of 261708603680011 is 110086306807162.

It is a happy number.

It is not a de Polignac number, because 261708603680011 - 2³ = 261708603680003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261708603680081) 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 in 11 ways as a sum of consecutive naturals, for example, 29535621 + ... + 37360006.

Almost surely, 2^{261708603680011} is an apocalyptic number.

261708603680011 is a deficient number, since it is larger than the sum of its proper divisors (16320730962237).

261708603680011 is a wasteful number, since it uses less digits than its factorization.

261708603680011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66909198 (or 66909181 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 49.

The spelling of 261708603680011 in words is "two hundred sixty-one trillion, seven hundred eight billion, six hundred three million, six hundred eighty thousand, eleven".