261282336561173 has 4 divisors (see below), whose sum is σ = 261283517436768. Its totient is φ = 261281155685580.

The previous prime is 261282336561137. The next prime is 261282336561199. The reversal of 261282336561173 is 371165633282162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261282336561173 - 2³⁶ = 261213617084437 is a prime.

It is a super-2 number, since 2×261282336561173² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261282336561473) 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 3 ways as a sum of consecutive naturals, for example, 590105843 + ... + 590548448.

It is an arithmetic number, because the mean of its divisors is an integer number (65320879359192).

Almost surely, 2^{261282336561173} is an apocalyptic number.

It is an amenable number.

261282336561173 is a deficient number, since it is larger than the sum of its proper divisors (1180875595).

261282336561173 is a wasteful number, since it uses less digits than its factorization.

261282336561173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180875594.

The product of its digits is 13063680, while the sum is 56.

The spelling of 261282336561173 in words is "two hundred sixty-one trillion, two hundred eighty-two billion, three hundred thirty-six million, five hundred sixty-one thousand, one hundred seventy-three".