1318755078681 has 4 divisors (see below), whose sum is σ = 1758340104912. Its totient is φ = 879170052452.

The previous prime is 1318755078673. The next prime is 1318755078709. The reversal of 1318755078681 is 1868705578131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1318755078681 - 2³ = 1318755078673 is a prime.

It is a super-2 number, since 2×1318755078681² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1318755028681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219792513111 + ... + 219792513116.

It is an arithmetic number, because the mean of its divisors is an integer number (439585026228).

Almost surely, 2^{1318755078681} is an apocalyptic number.

It is an amenable number.

1318755078681 is a deficient number, since it is larger than the sum of its proper divisors (439585026231).

1318755078681 is an equidigital number, since it uses as much as digits as its factorization.

1318755078681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439585026230.

The product of its (nonzero) digits is 11289600, while the sum is 60.

It can be divided in two parts, 13187550 and 78681, that added together give a palindrome (13266231).

The spelling of 1318755078681 in words is "one trillion, three hundred eighteen billion, seven hundred fifty-five million, seventy-eight thousand, six hundred eighty-one".