9952945661 has 2 divisors, whose sum is σ = 9952945662. Its totient is φ = 9952945660.

The previous prime is 9952945649. The next prime is 9952945697. The reversal of 9952945661 is 1665492599.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7756148761 + 2196796900 = 88069^2 + 46870^2 .

It is a cyclic number.

It is not a de Polignac number, because 9952945661 - 2¹⁰ = 9952944637 is a prime.

It is a super-2 number, since 2×9952945661² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9952945597 and 9952945606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9952945861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4976472830 + 4976472831.

It is an arithmetic number, because the mean of its divisors is an integer number (4976472831).

Almost surely, 2^9952945661 is an apocalyptic number.

It is an amenable number.

9952945661 is a deficient number, since it is larger than the sum of its proper divisors (1).

9952945661 is an equidigital number, since it uses as much as digits as its factorization.

9952945661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5248800, while the sum is 56.

The square root of 9952945661 is about 99764.4508880794. The cubic root of 9952945661 is about 2151.0501926164.

The spelling of 9952945661 in words is "nine billion, nine hundred fifty-two million, nine hundred forty-five thousand, six hundred sixty-one".