1338566278447 has 4 divisors (see below), whose sum is σ = 1338719810080. Its totient is φ = 1338412746816.

The previous prime is 1338566278429. The next prime is 1338566278477. The reversal of 1338566278447 is 7448726658331.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1338566278447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1338566278477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76752738 + ... + 76770175.

It is an arithmetic number, because the mean of its divisors is an integer number (334679952520).

Almost surely, 2^{1338566278447} is an apocalyptic number.

1338566278447 is a deficient number, since it is larger than the sum of its proper divisors (153531633).

1338566278447 is an equidigital number, since it uses as much as digits as its factorization.

1338566278447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153531632.

The product of its digits is 162570240, while the sum is 64.

The spelling of 1338566278447 in words is "one trillion, three hundred thirty-eight billion, five hundred sixty-six million, two hundred seventy-eight thousand, four hundred forty-seven".