261796855984 has 20 divisors (see below), whose sum is σ = 518023567584. Its totient is φ = 128113354688.

The previous prime is 261796855949. The next prime is 261796856029. The reversal of 261796855984 is 489558697162.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174066307 + ... + 174067810.

Almost surely, 2^261796855984 is an apocalyptic number.

It is an amenable number.

261796855984 is a deficient number, since it is larger than the sum of its proper divisors (256226711600).

261796855984 is a wasteful number, since it uses less digits than its factorization.

261796855984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348134172 (or 348134166 counting only the distinct ones).

The product of its digits is 261273600, while the sum is 70.

The spelling of 261796855984 in words is "two hundred sixty-one billion, seven hundred ninety-six million, eight hundred fifty-five thousand, nine hundred eighty-four".