1671256289281 has 2 divisors, whose sum is σ = 1671256289282. Its totient is φ = 1671256289280.

The previous prime is 1671256289267. The next prime is 1671256289309. The reversal of 1671256289281 is 1829826521761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1547996314225 + 123259975056 = 1244185^2 + 351084^2 .

It is a cyclic number.

It is not a de Polignac number, because 1671256289281 - 2¹⁹ = 1671255764993 is a prime.

It is a super-2 number, since 2×1671256289281² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1671256289581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835628144640 + 835628144641.

It is an arithmetic number, because the mean of its divisors is an integer number (835628144641).

Almost surely, 2^{1671256289281} is an apocalyptic number.

It is an amenable number.

1671256289281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1671256289281 is an equidigital number, since it uses as much as digits as its factorization.

1671256289281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5806080, while the sum is 58.

The spelling of 1671256289281 in words is "one trillion, six hundred seventy-one billion, two hundred fifty-six million, two hundred eighty-nine thousand, two hundred eighty-one".