261543150544255 has 4 divisors (see below), whose sum is σ = 313851780653112. Its totient is φ = 209234520435400.

The previous prime is 261543150544229. The next prime is 261543150544283. The reversal of 261543150544255 is 552445051345162.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 261543150544255 - 2⁵ = 261543150544223 is a prime.

It is a super-2 number, since 2×261543150544255² (a number of 30 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 26154315054421 + ... + 26154315054430.

It is an arithmetic number, because the mean of its divisors is an integer number (78462945163278).

Almost surely, 2^{261543150544255} is an apocalyptic number.

261543150544255 is a deficient number, since it is larger than the sum of its proper divisors (52308630108857).

261543150544255 is an equidigital number, since it uses as much as digits as its factorization.

261543150544255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52308630108856.

The product of its (nonzero) digits is 14400000, while the sum is 52.

The spelling of 261543150544255 in words is "two hundred sixty-one trillion, five hundred forty-three billion, one hundred fifty million, five hundred forty-four thousand, two hundred fifty-five".