9960554561 has 2 divisors, whose sum is σ = 9960554562. Its totient is φ = 9960554560.

The previous prime is 9960554543. The next prime is 9960554621. The reversal of 9960554561 is 1654550699.

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., 7551610000 + 2408944561 = 86900^2 + 49081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9960554561 is a prime.

It is not a weakly prime, because it can be changed into another prime (9960584561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4980277280 + 4980277281.

It is an arithmetic number, because the mean of its divisors is an integer number (4980277281).

Almost surely, 2^9960554561 is an apocalyptic number.

It is an amenable number.

9960554561 is a deficient number, since it is larger than the sum of its proper divisors (1).

9960554561 is an equidigital number, since it uses as much as digits as its factorization.

9960554561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458000, while the sum is 50.

The square root of 9960554561 is about 99802.5779276267. The cubic root of 9960554561 is about 2151.5982031357.

The spelling of 9960554561 in words is "nine billion, nine hundred sixty million, five hundred fifty-four thousand, five hundred sixty-one".