17965730561 has 2 divisors, whose sum is σ = 17965730562. Its totient is φ = 17965730560.

The previous prime is 17965730551. The next prime is 17965730567. The reversal of 17965730561 is 16503756971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14538330625 + 3427399936 = 120575^2 + 58544^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17965730561 is a prime.

It is not a weakly prime, because it can be changed into another prime (17965730567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8982865280 + 8982865281.

It is an arithmetic number, because the mean of its divisors is an integer number (8982865281).

Almost surely, 2^17965730561 is an apocalyptic number.

It is an amenable number.

17965730561 is a deficient number, since it is larger than the sum of its proper divisors (1).

17965730561 is an equidigital number, since it uses as much as digits as its factorization.

17965730561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1190700, while the sum is 50.

The spelling of 17965730561 in words is "seventeen billion, nine hundred sixty-five million, seven hundred thirty thousand, five hundred sixty-one".