261568134873 has 40 divisors (see below), whose sum is σ = 393398026560. Its totient is φ = 173195388000.

The previous prime is 261568134857. The next prime is 261568134881. The reversal of 261568134873 is 378431865162.

261568134873 is a `hidden beast` number, since 2 + 6 + 1 + 568 + 1 + 3 + 4 + 8 + 73 = 666.

It is not a de Polignac number, because 261568134873 - 2⁴ = 261568134857 is a prime.

It is a super-2 number, since 2×261568134873² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (261568134173) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 7280911 + ... + 7316747.

It is an arithmetic number, because the mean of its divisors is an integer number (9834950664).

Almost surely, 2^261568134873 is an apocalyptic number.

It is an amenable number.

261568134873 is a deficient number, since it is larger than the sum of its proper divisors (131829891687).

261568134873 is a wasteful number, since it uses less digits than its factorization.

261568134873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36459 (or 36450 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The spelling of 261568134873 in words is "two hundred sixty-one billion, five hundred sixty-eight million, one hundred thirty-four thousand, eight hundred seventy-three".