1260505520561 has 16 divisors (see below), whose sum is σ = 1516436275200. Its totient is φ = 1023542299728.

The previous prime is 1260505520497. The next prime is 1260505520581. The reversal of 1260505520561 is 1650255050621.

It is a cyclic number.

It is not a de Polignac number, because 1260505520561 - 2⁶ = 1260505520497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1260505520581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6457946 + ... + 6650268.

It is an arithmetic number, because the mean of its divisors is an integer number (94777267200).

Almost surely, 2^{1260505520561} is an apocalyptic number.

It is an amenable number.

1260505520561 is a deficient number, since it is larger than the sum of its proper divisors (255930754639).

1260505520561 is a wasteful number, since it uses less digits than its factorization.

1260505520561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241628.

The product of its (nonzero) digits is 90000, while the sum is 38.

The spelling of 1260505520561 in words is "one trillion, two hundred sixty billion, five hundred five million, five hundred twenty thousand, five hundred sixty-one".