261341643455 has 8 divisors (see below), whose sum is σ = 313743950304. Its totient is φ = 208983996000.

The previous prime is 261341643443. The next prime is 261341643463. The reversal of 261341643455 is 554346143162.

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

It is not a de Polignac number, because 261341643455 - 2⁴ = 261341643439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11151971 + ... + 11175380.

It is an arithmetic number, because the mean of its divisors is an integer number (39217993788).

Almost surely, 2^261341643455 is an apocalyptic number.

261341643455 is a deficient number, since it is larger than the sum of its proper divisors (52402306849).

261341643455 is a wasteful number, since it uses less digits than its factorization.

261341643455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22329697.

The product of its digits is 1036800, while the sum is 44.

The spelling of 261341643455 in words is "two hundred sixty-one billion, three hundred forty-one million, six hundred forty-three thousand, four hundred fifty-five".