6612941561 has 2 divisors, whose sum is σ = 6612941562. Its totient is φ = 6612941560.

The previous prime is 6612941557. The next prime is 6612941563. The reversal of 6612941561 is 1651492166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4705960000 + 1906981561 = 68600^2 + 43669^2 .

It is a cyclic number.

It is not a de Polignac number, because 6612941561 - 2² = 6612941557 is a prime.

It is a super-2 number, since 2×6612941561² = 87461992178402233442, which contains 22 as substring.

Together with 6612941563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6612941563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3306470780 + 3306470781.

It is an arithmetic number, because the mean of its divisors is an integer number (3306470781).

Almost surely, 2^6612941561 is an apocalyptic number.

It is an amenable number.

6612941561 is a deficient number, since it is larger than the sum of its proper divisors (1).

6612941561 is an equidigital number, since it uses as much as digits as its factorization.

6612941561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 41.

The square root of 6612941561 is about 81319.9948413673. The cubic root of 6612941561 is about 1877.0026896507.

The spelling of 6612941561 in words is "six billion, six hundred twelve million, nine hundred forty-one thousand, five hundred sixty-one".