343639121681 has 2 divisors, whose sum is σ = 343639121682. Its totient is φ = 343639121680.

The previous prime is 343639121653. The next prime is 343639121719. The reversal of 343639121681 is 186121936343.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 331113930625 + 12525191056 = 575425^2 + 111916^2 .

It is a cyclic number.

It is not a de Polignac number, because 343639121681 - 2¹⁴ = 343639105297 is a prime.

It is a super-2 number, since 2×343639121681² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (343639121981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171819560840 + 171819560841.

It is an arithmetic number, because the mean of its divisors is an integer number (171819560841).

Almost surely, 2^343639121681 is an apocalyptic number.

It is an amenable number.

343639121681 is a deficient number, since it is larger than the sum of its proper divisors (1).

343639121681 is an equidigital number, since it uses as much as digits as its factorization.

343639121681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 47.

The spelling of 343639121681 in words is "three hundred forty-three billion, six hundred thirty-nine million, one hundred twenty-one thousand, six hundred eighty-one".