6820559613 has 64 divisors (see below), whose sum is σ = 12558021120. Its totient is φ = 3568997376.

The previous prime is 6820559609. The next prime is 6820559617. The reversal of 6820559613 is 3169550286.

6820559613 is a `hidden beast` number, since 6 + 8 + 20 + 5 + 5 + 9 + 613 = 666.

It is an interprime number because it is at equal distance from previous prime (6820559609) and next prime (6820559617).

It is not a de Polignac number, because 6820559613 - 2² = 6820559609 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6820559617) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 90195 + ... + 147567.

It is an arithmetic number, because the mean of its divisors is an integer number (196219080).

Almost surely, 2^6820559613 is an apocalyptic number.

6820559613 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

6820559613 is a deficient number, since it is larger than the sum of its proper divisors (5737461507).

6820559613 is a wasteful number, since it uses less digits than its factorization.

6820559613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57443 (or 57437 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 6820559613 is about 82586.6793920182. The cubic root of 6820559613 is about 1896.4439129423.

The spelling of 6820559613 in words is "six billion, eight hundred twenty million, five hundred fifty-nine thousand, six hundred thirteen".