5661818089 has 2 divisors, whose sum is σ = 5661818090. Its totient is φ = 5661818088.

The previous prime is 5661818081. The next prime is 5661818143. The reversal of 5661818089 is 9808181665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5207787225 + 454030864 = 72165^2 + 21308^2 .

It is a cyclic number.

It is not a de Polignac number, because 5661818089 - 2³ = 5661818081 is a prime.

It is a super-2 number, since 2×5661818089² = 64112368145855223842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5661818081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2830909044 + 2830909045.

It is an arithmetic number, because the mean of its divisors is an integer number (2830909045).

Almost surely, 2^5661818089 is an apocalyptic number.

It is an amenable number.

5661818089 is a deficient number, since it is larger than the sum of its proper divisors (1).

5661818089 is an equidigital number, since it uses as much as digits as its factorization.

5661818089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 829440, while the sum is 52.

The square root of 5661818089 is about 75245.0535849367. The cubic root of 5661818089 is about 1782.3184544044.

The spelling of 5661818089 in words is "five billion, six hundred sixty-one million, eight hundred eighteen thousand, eighty-nine".