1378511166217 has 2 divisors, whose sum is σ = 1378511166218. Its totient is φ = 1378511166216.

The previous prime is 1378511166203. The next prime is 1378511166233. The reversal of 1378511166217 is 7126611158731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1167774164496 + 210737001721 = 1080636^2 + 459061^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378511166217 - 2⁷ = 1378511166089 is a prime.

It is a super-4 number, since 4×1378511166217⁴ (a number of 50 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (1378511160217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689255583108 + 689255583109.

It is an arithmetic number, because the mean of its divisors is an integer number (689255583109).

Almost surely, 2^{1378511166217} is an apocalyptic number.

It is an amenable number.

1378511166217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378511166217 is an equidigital number, since it uses as much as digits as its factorization.

1378511166217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 49.

The spelling of 1378511166217 in words is "one trillion, three hundred seventy-eight billion, five hundred eleven million, one hundred sixty-six thousand, two hundred seventeen".