261441016650 has 144 divisors (see below), whose sum is σ = 767408204160. Its totient is φ = 63284659200.

The previous prime is 261441016631. The next prime is 261441016691. The reversal of 261441016650 is 56610144162.

261441016650 is a `hidden beast` number, since 2 + 6 + 1 + 441 + 0 + 166 + 50 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3292111 + ... + 3370589.

It is an arithmetic number, because the mean of its divisors is an integer number (5329223640).

Almost surely, 2^261441016650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261441016650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (383704102080).

261441016650 is an abundant number, since it is smaller than the sum of its proper divisors (505967187510).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261441016650 is a wasteful number, since it uses less digits than its factorization.

261441016650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79181 (or 79173 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 261441016650 in words is "two hundred sixty-one billion, four hundred forty-one million, sixteen thousand, six hundred fifty".