1378323217345 has 16 divisors (see below), whose sum is σ = 1711649394000. Its totient is φ = 1064245439488.

The previous prime is 1378323217333. The next prime is 1378323217387. The reversal of 1378323217345 is 5437123238731.

It can be written as a sum of positive squares in 8 ways, for example, as 33319391296 + 1345003826049 = 182536^2 + 1159743^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378323217345 - 2²⁵ = 1378289662913 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1345900 + ... + 2137309.

It is an arithmetic number, because the mean of its divisors is an integer number (106978087125).

Almost surely, 2^{1378323217345} is an apocalyptic number.

It is an amenable number.

1378323217345 is a deficient number, since it is larger than the sum of its proper divisors (333326176655).

1378323217345 is a wasteful number, since it uses less digits than its factorization.

1378323217345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3485972.

The product of its digits is 2540160, while the sum is 49.

The spelling of 1378323217345 in words is "one trillion, three hundred seventy-eight billion, three hundred twenty-three million, two hundred seventeen thousand, three hundred forty-five".