261562725740447 has 4 divisors (see below), whose sum is σ = 264873646319520. Its totient is φ = 258251805161376.

The previous prime is 261562725740417. The next prime is 261562725740471. The reversal of 261562725740447 is 744047527265162.

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

It is a cyclic number.

It is not a de Polignac number, because 261562725740447 - 2³⁰ = 261561651998623 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261562725740447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261562725740417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1655460289418 + ... + 1655460289575.

It is an arithmetic number, because the mean of its divisors is an integer number (66218411579880).

Almost surely, 2^{261562725740447} is an apocalyptic number.

261562725740447 is a deficient number, since it is larger than the sum of its proper divisors (3310920579073).

261562725740447 is an equidigital number, since it uses as much as digits as its factorization.

261562725740447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3310920579072.

The product of its (nonzero) digits is 158054400, while the sum is 62.

The spelling of 261562725740447 in words is "two hundred sixty-one trillion, five hundred sixty-two billion, seven hundred twenty-five million, seven hundred forty thousand, four hundred forty-seven".