1263798659344 has 75 divisors (see below), whose sum is σ = 2654249643843. Its totient is φ = 582940942272.

The previous prime is 1263798659341. The next prime is 1263798659407. The reversal of 1263798659344 is 4439568973621.

The square root of 1263798659344 is 1124188.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 2 ways, for example, as 626611561744 + 637187097600 = 791588^2 + 798240^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1263798659344.

It is not an unprimeable number, because it can be changed into a prime (1263798659341) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 759950257 + ... + 759951919.

Almost surely, 2^{1263798659344} is an apocalyptic number.

1263798659344 is the 1124188-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1263798659344

1263798659344 is an abundant number, since it is smaller than the sum of its proper divisors (1390450984499).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1263798659344 is an frugal number, since it uses more digits than its factorization.

1263798659344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3386 (or 1678 counting only the distinct ones).

The product of its digits is 235146240, while the sum is 67.

The spelling of 1263798659344 in words is "one trillion, two hundred sixty-three billion, seven hundred ninety-eight million, six hundred fifty-nine thousand, three hundred forty-four".