1378860801161 has 2 divisors, whose sum is σ = 1378860801162. Its totient is φ = 1378860801160.

The previous prime is 1378860801023. The next prime is 1378860801167. The reversal of 1378860801161 is 1611080688731.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1363187013136 + 15673788025 = 1167556^2 + 125195^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378860801161 - 2³⁴ = 1361680931977 is a prime.

It is not a weakly prime, because it can be changed into another prime (1378860801167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689430400580 + 689430400581.

It is an arithmetic number, because the mean of its divisors is an integer number (689430400581).

Almost surely, 2^{1378860801161} is an apocalyptic number.

It is an amenable number.

1378860801161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378860801161 is an equidigital number, since it uses as much as digits as its factorization.

1378860801161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 50.

The spelling of 1378860801161 in words is "one trillion, three hundred seventy-eight billion, eight hundred sixty million, eight hundred one thousand, one hundred sixty-one".