6216346681 has 2 divisors, whose sum is σ = 6216346682. Its totient is φ = 6216346680.

The previous prime is 6216346673. The next prime is 6216346723. The reversal of 6216346681 is 1866436126.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5498964025 + 717382656 = 74155^2 + 26784^2 .

It is a cyclic number.

It is not a de Polignac number, because 6216346681 - 2³ = 6216346673 is a prime.

It is a super-2 number, since 2×6216346681² = 77285932116759431522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6216346481) 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, 3108173340 + 3108173341.

It is an arithmetic number, because the mean of its divisors is an integer number (3108173341).

Almost surely, 2^6216346681 is an apocalyptic number.

It is an amenable number.

6216346681 is a deficient number, since it is larger than the sum of its proper divisors (1).

6216346681 is an equidigital number, since it uses as much as digits as its factorization.

6216346681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 43.

The square root of 6216346681 is about 78843.8119385409. The cubic root of 6216346681 is about 1838.7036671920.

The spelling of 6216346681 in words is "six billion, two hundred sixteen million, three hundred forty-six thousand, six hundred eighty-one".