261746522345 has 64 divisors (see below), whose sum is σ = 412396185600. Its totient is φ = 154509327360.

The previous prime is 261746522341. The next prime is 261746522347. The reversal of 261746522345 is 543225647162.

It is not a de Polignac number, because 261746522345 - 2² = 261746522341 is a prime.

It is a super-2 number, since 2×261746522345² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 261746522345.

It is not an unprimeable number, because it can be changed into a prime (261746522341) 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 63 ways as a sum of consecutive naturals, for example, 19443857 + ... + 19457313.

It is an arithmetic number, because the mean of its divisors is an integer number (6443690400).

Almost surely, 2^261746522345 is an apocalyptic number.

It is an amenable number.

261746522345 is a deficient number, since it is larger than the sum of its proper divisors (150649663255).

261746522345 is a wasteful number, since it uses less digits than its factorization.

261746522345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16158.

The product of its digits is 2419200, while the sum is 47.

The spelling of 261746522345 in words is "two hundred sixty-one billion, seven hundred forty-six million, five hundred twenty-two thousand, three hundred forty-five".