3340686956821 has 2 divisors, whose sum is σ = 3340686956822. Its totient is φ = 3340686956820.

The previous prime is 3340686956801. The next prime is 3340686956969. The reversal of 3340686956821 is 1286596860433.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1719012054321 + 1621674902500 = 1311111^2 + 1273450^2 .

It is a cyclic number.

It is not a de Polignac number, because 3340686956821 - 2¹⁵ = 3340686924053 is a prime.

It is a super-2 number, since 2×3340686956821² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3340686956821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3340686956801) 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, 1670343478410 + 1670343478411.

It is an arithmetic number, because the mean of its divisors is an integer number (1670343478411).

Almost surely, 2^{3340686956821} is an apocalyptic number.

It is an amenable number.

3340686956821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3340686956821 is an equidigital number, since it uses as much as digits as its factorization.

3340686956821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 44789760, while the sum is 61.

The spelling of 3340686956821 in words is "three trillion, three hundred forty billion, six hundred eighty-six million, nine hundred fifty-six thousand, eight hundred twenty-one".