1263126382066 has 4 divisors (see below), whose sum is σ = 1894689573102. Its totient is φ = 631563191032.

The previous prime is 1263126382061. The next prime is 1263126382097. The reversal of 1263126382066 is 6602836213621.

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

It can be written as a sum of positive squares in only one way, i.e., 1258388124841 + 4738257225 = 1121779^2 + 68835^2 .

It is a super-2 number, since 2×1263126382066² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1263126382061) 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 as a sum of consecutive naturals, namely, 315781595515 + ... + 315781595518.

Almost surely, 2^{1263126382066} is an apocalyptic number.

1263126382066 is a deficient number, since it is larger than the sum of its proper divisors (631563191036).

1263126382066 is an equidigital number, since it uses as much as digits as its factorization.

1263126382066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631563191035.

The product of its (nonzero) digits is 746496, while the sum is 46.

The spelling of 1263126382066 in words is "one trillion, two hundred sixty-three billion, one hundred twenty-six million, three hundred eighty-two thousand, sixty-six".