2080685561 has 2 divisors, whose sum is σ = 2080685562. Its totient is φ = 2080685560.

The previous prime is 2080685549. The next prime is 2080685567. The reversal of 2080685561 is 1655860802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1736805625 + 343879936 = 41675^2 + 18544^2 .

It is a cyclic number.

It is not a de Polignac number, because 2080685561 - 2²² = 2076491257 is a prime.

It is not a weakly prime, because it can be changed into another prime (2080685567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1040342780 + 1040342781.

It is an arithmetic number, because the mean of its divisors is an integer number (1040342781).

Almost surely, 2^2080685561 is an apocalyptic number.

It is an amenable number.

2080685561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2080685561 is an equidigital number, since it uses as much as digits as its factorization.

2080685561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 115200, while the sum is 41.

The square root of 2080685561 is about 45614.5323444185. The cubic root of 2080685561 is about 1276.6410878294.

The spelling of 2080685561 in words is "two billion, eighty million, six hundred eighty-five thousand, five hundred sixty-one".