1378511448205 has 4 divisors (see below), whose sum is σ = 1654213737852. Its totient is φ = 1102809158560.

The previous prime is 1378511448133. The next prime is 1378511448217. The reversal of 1378511448205 is 5028441158731.

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

It can be written as a sum of positive squares in 2 ways, for example, as 706604997604 + 671906450601 = 840598^2 + 819699^2 .

It is not a de Polignac number, because 1378511448205 - 2⁹ = 1378511447693 is a prime.

It is a super-4 number, since 4×1378511448205⁴ (a number of 50 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137851144816 + ... + 137851144825.

It is an arithmetic number, because the mean of its divisors is an integer number (413553434463).

Almost surely, 2^{1378511448205} is an apocalyptic number.

It is an amenable number.

1378511448205 is a deficient number, since it is larger than the sum of its proper divisors (275702289647).

1378511448205 is an equidigital number, since it uses as much as digits as its factorization.

1378511448205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275702289646.

The product of its (nonzero) digits is 1075200, while the sum is 49.

The spelling of 1378511448205 in words is "one trillion, three hundred seventy-eight billion, five hundred eleven million, four hundred forty-eight thousand, two hundred five".