1667804454361 has 2 divisors, whose sum is σ = 1667804454362. Its totient is φ = 1667804454360.

The previous prime is 1667804454149. The next prime is 1667804454389. The reversal of 1667804454361 is 1634544087661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1226901814336 + 440902640025 = 1107656^2 + 664005^2 .

It is a cyclic number.

It is not a de Polignac number, because 1667804454361 - 2¹³ = 1667804446169 is a prime.

It is a super-4 number, since 4×1667804454361⁴ (a number of 50 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (1667804454461) 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, 833902227180 + 833902227181.

It is an arithmetic number, because the mean of its divisors is an integer number (833902227181).

Almost surely, 2^{1667804454361} is an apocalyptic number.

It is an amenable number.

1667804454361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1667804454361 is an equidigital number, since it uses as much as digits as its factorization.

1667804454361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11612160, while the sum is 55.

The spelling of 1667804454361 in words is "one trillion, six hundred sixty-seven billion, eight hundred four million, four hundred fifty-four thousand, three hundred sixty-one".