260781178221 has 12 divisors (see below), whose sum is σ = 376700950080. Its totient is φ = 173846260680.

The previous prime is 260781178159. The next prime is 260781178247. The reversal of 260781178221 is 122871187062.

260781178221 is a `hidden beast` number, since 2 + 607 + 8 + 1 + 17 + 8 + 2 + 21 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-260781178221 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (260781178271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 440991 + ... + 846188.

It is an arithmetic number, because the mean of its divisors is an integer number (31391745840).

Almost surely, 2^260781178221 is an apocalyptic number.

It is an amenable number.

260781178221 is a deficient number, since it is larger than the sum of its proper divisors (115919771859).

260781178221 is a wasteful number, since it uses less digits than its factorization.

260781178221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309696 (or 1309693 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 45.

The spelling of 260781178221 in words is "two hundred sixty billion, seven hundred eighty-one million, one hundred seventy-eight thousand, two hundred twenty-one".