261647577720411 has 8 divisors (see below), whose sum is σ = 348871443547920. Its totient is φ = 174427715186592.

The previous prime is 261647577720343. The next prime is 261647577720413. The reversal of 261647577720411 is 114027775746162.

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

It is not a de Polignac number, because 261647577720411 - 2¹¹ = 261647577718363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261647577720413) 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, 1000670916 + ... + 1000932353.

It is an arithmetic number, because the mean of its divisors is an integer number (43608930443490).

Almost surely, 2^{261647577720411} is an apocalyptic number.

261647577720411 is a deficient number, since it is larger than the sum of its proper divisors (87223865827509).

261647577720411 is a wasteful number, since it uses less digits than its factorization.

261647577720411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001646845.

The product of its (nonzero) digits is 27659520, while the sum is 60.

The spelling of 261647577720411 in words is "two hundred sixty-one trillion, six hundred forty-seven billion, five hundred seventy-seven million, seven hundred twenty thousand, four hundred eleven".