6624733661561 has 2 divisors, whose sum is σ = 6624733661562. Its totient is φ = 6624733661560.

The previous prime is 6624733661543. The next prime is 6624733661593. The reversal of 6624733661561 is 1651663374266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5420049610000 + 1204684051561 = 2328100^2 + 1097581^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6624733661561 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6624733661497 and 6624733661506.

It is not a weakly prime, because it can be changed into another prime (6624733651561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3312366830780 + 3312366830781.

It is an arithmetic number, because the mean of its divisors is an integer number (3312366830781).

Almost surely, 2^{6624733661561} is an apocalyptic number.

It is an amenable number.

6624733661561 is a deficient number, since it is larger than the sum of its proper divisors (1).

6624733661561 is an equidigital number, since it uses as much as digits as its factorization.

6624733661561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19595520, while the sum is 56.

The spelling of 6624733661561 in words is "six trillion, six hundred twenty-four billion, seven hundred thirty-three million, six hundred sixty-one thousand, five hundred sixty-one".