6636632161 has 2 divisors, whose sum is σ = 6636632162. Its totient is φ = 6636632160.

The previous prime is 6636632143. The next prime is 6636632183. The reversal of 6636632161 is 1612366366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5195670561 + 1440961600 = 72081^2 + 37960^2 .

It is a cyclic number.

It is not a de Polignac number, because 6636632161 - 2⁷ = 6636632033 is a prime.

It is not a weakly prime, because it can be changed into another prime (6636632111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3318316080 + 3318316081.

It is an arithmetic number, because the mean of its divisors is an integer number (3318316081).

Almost surely, 2^6636632161 is an apocalyptic number.

It is an amenable number.

6636632161 is a deficient number, since it is larger than the sum of its proper divisors (1).

6636632161 is an equidigital number, since it uses as much as digits as its factorization.

6636632161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 40.

The square root of 6636632161 is about 81465.5274395250. The cubic root of 6636632161 is about 1879.2414475036.

The spelling of 6636632161 in words is "six billion, six hundred thirty-six million, six hundred thirty-two thousand, one hundred sixty-one".