6618463180561 has 2 divisors, whose sum is σ = 6618463180562. Its totient is φ = 6618463180560.

The previous prime is 6618463180559. The next prime is 6618463180597. The reversal of 6618463180561 is 1650813648166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3704204486161 + 2914258694400 = 1924631^2 + 1707120^2 .

It is a cyclic number.

It is not a de Polignac number, because 6618463180561 - 2¹ = 6618463180559 is a prime.

Together with 6618463180559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6618463180541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3309231590280 + 3309231590281.

It is an arithmetic number, because the mean of its divisors is an integer number (3309231590281).

Almost surely, 2^{6618463180561} is an apocalyptic number.

It is an amenable number.

6618463180561 is a deficient number, since it is larger than the sum of its proper divisors (1).

6618463180561 is an equidigital number, since it uses as much as digits as its factorization.

6618463180561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4976640, while the sum is 55.

The spelling of 6618463180561 in words is "six trillion, six hundred eighteen billion, four hundred sixty-three million, one hundred eighty thousand, five hundred sixty-one".