6418437681 has 8 divisors (see below), whose sum is σ = 8559236320. Its totient is φ = 4278298752.

The previous prime is 6418437539. The next prime is 6418437689. The reversal of 6418437681 is 1867348146.

6418437681 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6418437681 - 2¹³ = 6418429489 is a prime.

It is a super-2 number, since 2×6418437681² = 82392684529761315522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6418437681.

It is not an unprimeable number, because it can be changed into a prime (6418437689) 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 in 7 ways as a sum of consecutive naturals, for example, 141760 + ... + 181473.

It is an arithmetic number, because the mean of its divisors is an integer number (1069904540).

Almost surely, 2^6418437681 is an apocalyptic number.

It is an amenable number.

6418437681 is a deficient number, since it is larger than the sum of its proper divisors (2140798639).

6418437681 is a wasteful number, since it uses less digits than its factorization.

6418437681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329855.

The product of its digits is 774144, while the sum is 48.

The square root of 6418437681 is about 80115.1526304481. The cubic root of 6418437681 is about 1858.4167435134.

The spelling of 6418437681 in words is "six billion, four hundred eighteen million, four hundred thirty-seven thousand, six hundred eighty-one".