1263537345073 has 4 divisors (see below), whose sum is σ = 1272760245540. Its totient is φ = 1254314444608.

The previous prime is 1263537345047. The next prime is 1263537345113. The reversal of 1263537345073 is 3705437353621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 797713349904 + 465823995169 = 893148^2 + 682513^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263537345073 - 2⁹ = 1263537344561 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1263537345023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4611450028 + ... + 4611450301.

It is an arithmetic number, because the mean of its divisors is an integer number (318190061385).

Almost surely, 2^{1263537345073} is an apocalyptic number.

It is an amenable number.

1263537345073 is a deficient number, since it is larger than the sum of its proper divisors (9222900467).

1263537345073 is an equidigital number, since it uses as much as digits as its factorization.

1263537345073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9222900466.

The product of its (nonzero) digits is 4762800, while the sum is 49.

The spelling of 1263537345073 in words is "one trillion, two hundred sixty-three billion, five hundred thirty-seven million, three hundred forty-five thousand, seventy-three".