6446611081 has 2 divisors, whose sum is σ = 6446611082. Its totient is φ = 6446611080.

The previous prime is 6446611037. The next prime is 6446611103. The reversal of 6446611081 is 1801166446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4513689856 + 1932921225 = 67184^2 + 43965^2 .

It is a cyclic number.

It is not a de Polignac number, because 6446611081 - 2¹¹ = 6446609033 is a prime.

It is a super-3 number, since 3×6446611081³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 6446611081.

It is not a weakly prime, because it can be changed into another prime (6446611481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3223305540 + 3223305541.

It is an arithmetic number, because the mean of its divisors is an integer number (3223305541).

Almost surely, 2^6446611081 is an apocalyptic number.

It is an amenable number.

6446611081 is a deficient number, since it is larger than the sum of its proper divisors (1).

6446611081 is an equidigital number, since it uses as much as digits as its factorization.

6446611081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 6446611081 is about 80290.7907608338. The cubic root of 6446611081 is about 1861.1319160466.

The spelling of 6446611081 in words is "six billion, four hundred forty-six million, six hundred eleven thousand, eighty-one".