1263543542864 has 10 divisors (see below), whose sum is σ = 2448115614330. Its totient is φ = 631771771424.

The previous prime is 1263543542861. The next prime is 1263543542881. The reversal of 1263543542864 is 4682453453621.

It can be written as a sum of positive squares in only one way, i.e., 927769651264 + 335773891600 = 963208^2 + 579460^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263543542861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39485735699 + ... + 39485735730.

It is an arithmetic number, because the mean of its divisors is an integer number (244811561433).

Almost surely, 2^{1263543542864} is an apocalyptic number.

It is an amenable number.

1263543542864 is a deficient number, since it is larger than the sum of its proper divisors (1184572071466).

1263543542864 is an equidigital number, since it uses as much as digits as its factorization.

1263543542864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78971471437 (or 78971471431 counting only the distinct ones).

The product of its digits is 16588800, while the sum is 53.

The spelling of 1263543542864 in words is "one trillion, two hundred sixty-three billion, five hundred forty-three million, five hundred forty-two thousand, eight hundred sixty-four".