6840105561 has 32 divisors (see below), whose sum is σ = 10538035200. Its totient is φ = 4379679360.

The previous prime is 6840105557. The next prime is 6840105593. The reversal of 6840105561 is 1655010486.

6840105561 is a `hidden beast` number, since 6 + 84 + 0 + 10 + 5 + 561 = 666.

It is not a de Polignac number, because 6840105561 - 2² = 6840105557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6840105511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126685 + ... + 172421.

It is an arithmetic number, because the mean of its divisors is an integer number (329313600).

Almost surely, 2^6840105561 is an apocalyptic number.

It is an amenable number.

6840105561 is a deficient number, since it is larger than the sum of its proper divisors (3697929639).

6840105561 is a wasteful number, since it uses less digits than its factorization.

6840105561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45966 (or 45960 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 6840105561 is about 82704.9306933994. The cubic root of 6840105561 is about 1898.2537566889.

The spelling of 6840105561 in words is "six billion, eight hundred forty million, one hundred five thousand, five hundred sixty-one".