6700205561 has 16 divisors (see below), whose sum is σ = 7823894400. Its totient is φ = 5735504880.

The previous prime is 6700205557. The next prime is 6700205579. The reversal of 6700205561 is 1655020076.

It is a happy number.

It is not a de Polignac number, because 6700205561 - 2² = 6700205557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6700205531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 257531 + ... + 282351.

It is an arithmetic number, because the mean of its divisors is an integer number (488993400).

Almost surely, 2^6700205561 is an apocalyptic number.

It is an amenable number.

6700205561 is a deficient number, since it is larger than the sum of its proper divisors (1123688839).

6700205561 is an equidigital number, since it uses as much as digits as its factorization.

6700205561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25629 (or 25615 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 6700205561 is about 81854.7833727510. The cubic root of 6700205561 is about 1885.2229106419. Note that the first 3 decimals are identical.

The spelling of 6700205561 in words is "six billion, seven hundred million, two hundred five thousand, five hundred sixty-one".