378651406121 has 2 divisors, whose sum is σ = 378651406122. Its totient is φ = 378651406120.

The previous prime is 378651406103. The next prime is 378651406129. The reversal of 378651406121 is 121604156873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 312105464896 + 66545941225 = 558664^2 + 257965^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-378651406121 is a prime.

It is not a weakly prime, because it can be changed into another prime (378651406129) 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, 189325703060 + 189325703061.

It is an arithmetic number, because the mean of its divisors is an integer number (189325703061).

Almost surely, 2^378651406121 is an apocalyptic number.

It is an amenable number.

378651406121 is a deficient number, since it is larger than the sum of its proper divisors (1).

378651406121 is an equidigital number, since it uses as much as digits as its factorization.

378651406121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 378651406121 in words is "three hundred seventy-eight billion, six hundred fifty-one million, four hundred six thousand, one hundred twenty-one".