1381252565818 has 8 divisors (see below), whose sum is σ = 2073349313460. Its totient is φ = 690136128000.

The previous prime is 1381252565813. The next prime is 1381252565843. The reversal of 1381252565818 is 8185652521831.

It can be written as a sum of positive squares in 2 ways, for example, as 1313208278209 + 68044287609 = 1145953^2 + 260853^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1381252565813) 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, 245073933 + ... + 245079568.

Almost surely, 2^{1381252565818} is an apocalyptic number.

1381252565818 is a deficient number, since it is larger than the sum of its proper divisors (692096747642).

1381252565818 is a wasteful number, since it uses less digits than its factorization.

1381252565818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490154912.

The product of its digits is 4608000, while the sum is 55.

The spelling of 1381252565818 in words is "one trillion, three hundred eighty-one billion, two hundred fifty-two million, five hundred sixty-five thousand, eight hundred eighteen".