1260341051561 has 4 divisors (see below), whose sum is σ = 1260389850324. Its totient is φ = 1260292252800.

The previous prime is 1260341051537. The next prime is 1260341051587. The reversal of 1260341051561 is 1651501430621.

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

It can be written as a sum of positive squares in 2 ways, for example, as 871394245225 + 388946806336 = 933485^2 + 623656^2 .

It is a cyclic number.

It is not a de Polignac number, because 1260341051561 - 2³⁰ = 1259267309737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1260341011561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24360620 + ... + 24412301.

It is an arithmetic number, because the mean of its divisors is an integer number (315097462581).

Almost surely, 2^{1260341051561} is an apocalyptic number.

It is an amenable number.

1260341051561 is a deficient number, since it is larger than the sum of its proper divisors (48798763).

1260341051561 is an equidigital number, since it uses as much as digits as its factorization.

1260341051561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48798762.

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 1260341051561 in words is "one trillion, two hundred sixty billion, three hundred forty-one million, fifty-one thousand, five hundred sixty-one".