261543622430255 has 8 divisors (see below), whose sum is σ = 342384378454224. Its totient is φ = 190213543585600.

The previous prime is 261543622430197. The next prime is 261543622430399. The reversal of 261543622430255 is 552034226345162.

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

It is not a de Polignac number, because 261543622430255 - 2³⁴ = 261526442561071 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, 2377669294766 + ... + 2377669294875.

It is an arithmetic number, because the mean of its divisors is an integer number (42798047306778).

Almost surely, 2^{261543622430255} is an apocalyptic number.

261543622430255 is a deficient number, since it is larger than the sum of its proper divisors (80840756023969).

261543622430255 is a wasteful number, since it uses less digits than its factorization.

261543622430255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4755338589657.

The product of its (nonzero) digits is 10368000, while the sum is 50.

The spelling of 261543622430255 in words is "two hundred sixty-one trillion, five hundred forty-three billion, six hundred twenty-two million, four hundred thirty thousand, two hundred fifty-five".