1261581485863 has 32 divisors (see below), whose sum is σ = 1393713941760. Its totient is φ = 1137127280640.

The previous prime is 1261581485821. The next prime is 1261581485867. The reversal of 1261581485863 is 3685841851621.

It is a cyclic number.

It is not a de Polignac number, because 1261581485863 - 2³⁷ = 1124142532391 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1261581485798 and 1261581485807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261581485867) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9459681 + ... + 9592117.

It is an arithmetic number, because the mean of its divisors is an integer number (43553560680).

Almost surely, 2^{1261581485863} is an apocalyptic number.

1261581485863 is a deficient number, since it is larger than the sum of its proper divisors (132132455897).

1261581485863 is a wasteful number, since it uses less digits than its factorization.

1261581485863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132747.

The product of its digits is 11059200, while the sum is 58.

The spelling of 1261581485863 in words is "one trillion, two hundred sixty-one billion, five hundred eighty-one million, four hundred eighty-five thousand, eight hundred sixty-three".