1263661355564 has 24 divisors (see below), whose sum is σ = 2311774176768. Its totient is φ = 603254892240.

The previous prime is 1263661355557. The next prime is 1263661355573. The reversal of 1263661355564 is 4655531663621.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12504932 + ... + 12605579.

It is an arithmetic number, because the mean of its divisors is an integer number (96323924032).

Almost surely, 2^{1263661355564} is an apocalyptic number.

It is an amenable number.

1263661355564 is a deficient number, since it is larger than the sum of its proper divisors (1048112821204).

1263661355564 is a wasteful number, since it uses less digits than its factorization.

1263661355564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25111085 (or 25111083 counting only the distinct ones).

The product of its digits is 11664000, while the sum is 53.

The spelling of 1263661355564 in words is "one trillion, two hundred sixty-three billion, six hundred sixty-one million, three hundred fifty-five thousand, five hundred sixty-four".