10561720997 has 2 divisors, whose sum is σ = 10561720998. Its totient is φ = 10561720996.

The previous prime is 10561720963. The next prime is 10561721063. The reversal of 10561720997 is 79902716501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6751251556 + 3810469441 = 82166^2 + 61729^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10561720997 is a prime.

It is a super-2 number, since 2×10561720997² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10561720297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5280860498 + 5280860499.

It is an arithmetic number, because the mean of its divisors is an integer number (5280860499).

Almost surely, 2^10561720997 is an apocalyptic number.

It is an amenable number.

10561720997 is a deficient number, since it is larger than the sum of its proper divisors (1).

10561720997 is an equidigital number, since it uses as much as digits as its factorization.

10561720997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 238140, while the sum is 47.

The spelling of 10561720997 in words is "ten billion, five hundred sixty-one million, seven hundred twenty thousand, nine hundred ninety-seven".