1278468963518 has 4 divisors (see below), whose sum is σ = 1917703445280. Its totient is φ = 639234481758.

The previous prime is 1278468963491. The next prime is 1278468963521. The reversal of 1278468963518 is 8153698648721.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319617240878 + ... + 319617240881.

It is an arithmetic number, because the mean of its divisors is an integer number (479425861320).

Almost surely, 2^{1278468963518} is an apocalyptic number.

1278468963518 is a deficient number, since it is larger than the sum of its proper divisors (639234481762).

1278468963518 is an equidigital number, since it uses as much as digits as its factorization.

1278468963518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639234481761.

The product of its digits is 139345920, while the sum is 68.

The spelling of 1278468963518 in words is "one trillion, two hundred seventy-eight billion, four hundred sixty-eight million, nine hundred sixty-three thousand, five hundred eighteen".