261049220449 has 8 divisors (see below), whose sum is σ = 276410769408. Its totient is φ = 245688306240.

The previous prime is 261049220441. The next prime is 261049220489. The reversal of 261049220449 is 944022940162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261049220449 - 2³ = 261049220441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261049220441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 883744 + ... + 1141534.

It is an arithmetic number, because the mean of its divisors is an integer number (34551346176).

Almost surely, 2^261049220449 is an apocalyptic number.

It is an amenable number.

261049220449 is a deficient number, since it is larger than the sum of its proper divisors (15361548959).

261049220449 is a wasteful number, since it uses less digits than its factorization.

261049220449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317375.

The product of its (nonzero) digits is 248832, while the sum is 43.

The spelling of 261049220449 in words is "two hundred sixty-one billion, forty-nine million, two hundred twenty thousand, four hundred forty-nine".