6880020561 has 12 divisors (see below), whose sum is σ = 10073942788. Its totient is φ = 4523848704.

The previous prime is 6880020533. The next prime is 6880020617. The reversal of 6880020561 is 1650200886.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4015630161 + 2864390400 = 63369^2 + 53520^2 .

It is not a de Polignac number, because 6880020561 - 2⁵ = 6880020529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6880020661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5235280 + ... + 5236593.

Almost surely, 2^6880020561 is an apocalyptic number.

It is an amenable number.

6880020561 is a deficient number, since it is larger than the sum of its proper divisors (3193922227).

6880020561 is a wasteful number, since it uses less digits than its factorization.

6880020561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10471952 (or 10471949 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 6880020561 is about 82945.8893556516. The cubic root of 6880020561 is about 1901.9389772671.

The spelling of 6880020561 in words is "six billion, eight hundred eighty million, twenty thousand, five hundred sixty-one".