6820642569 has 32 divisors (see below), whose sum is σ = 9942876160. Its totient is φ = 4133892672.

The previous prime is 6820642529. The next prime is 6820642589. The reversal of 6820642569 is 9652460286.

It is a happy number.

It is not a de Polignac number, because 6820642569 - 2²¹ = 6818545417 is a prime.

It is a super-2 number, since 2×6820642569² = 93042330108109839522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6820642529) 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 31 ways as a sum of consecutive naturals, for example, 683514 + ... + 693420.

It is an arithmetic number, because the mean of its divisors is an integer number (310714880).

Almost surely, 2^6820642569 is an apocalyptic number.

It is an amenable number.

6820642569 is a deficient number, since it is larger than the sum of its proper divisors (3122233591).

6820642569 is a wasteful number, since it uses less digits than its factorization.

6820642569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10189.

The product of its (nonzero) digits is 1244160, while the sum is 48.

The square root of 6820642569 is about 82587.1816264485. The cubic root of 6820642569 is about 1896.4516014983.

The spelling of 6820642569 in words is "six billion, eight hundred twenty million, six hundred forty-two thousand, five hundred sixty-nine".