6609551161 has 2 divisors, whose sum is σ = 6609551162. Its totient is φ = 6609551160.

The previous prime is 6609551131. The next prime is 6609551197. The reversal of 6609551161 is 1611559066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3412779561 + 3196771600 = 58419^2 + 56540^2 .

It is a cyclic number.

It is not a de Polignac number, because 6609551161 - 2¹³ = 6609542969 is a prime.

It is not a weakly prime, because it can be changed into another prime (6609551131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3304775580 + 3304775581.

It is an arithmetic number, because the mean of its divisors is an integer number (3304775581).

Almost surely, 2^6609551161 is an apocalyptic number.

It is an amenable number.

6609551161 is a deficient number, since it is larger than the sum of its proper divisors (1).

6609551161 is an equidigital number, since it uses as much as digits as its factorization.

6609551161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 6609551161 is about 81299.1461271273. The cubic root of 6609551161 is about 1876.6818602727.

The spelling of 6609551161 in words is "six billion, six hundred nine million, five hundred fifty-one thousand, one hundred sixty-one".