6519426871681 has 16 divisors (see below), whose sum is σ = 6894236797056. Its totient is φ = 6152435030016.

The previous prime is 6519426871649. The next prime is 6519426871717. The reversal of 6519426871681 is 1861786249156.

It is a cyclic number.

It is not a de Polignac number, because 6519426871681 - 2⁵ = 6519426871649 is a prime.

It is a super-2 number, since 2×6519426871681² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6519426871631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 930240 + ... + 3728833.

It is an arithmetic number, because the mean of its divisors is an integer number (430889799816).

Almost surely, 2^{6519426871681} is an apocalyptic number.

It is an amenable number.

6519426871681 is a deficient number, since it is larger than the sum of its proper divisors (374809925375).

6519426871681 is a wasteful number, since it uses less digits than its factorization.

6519426871681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4659912.

The product of its digits is 34836480, while the sum is 64.

The spelling of 6519426871681 in words is "six trillion, five hundred nineteen billion, four hundred twenty-six million, eight hundred seventy-one thousand, six hundred eighty-one".