9658961881 has 2 divisors, whose sum is σ = 9658961882. Its totient is φ = 9658961880.

The previous prime is 9658961843. The next prime is 9658961891. The reversal of 9658961881 is 1881698569.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9658958400 + 3481 = 98280^2 + 59^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9658961881 is a prime.

It is a super-2 number, since 2×9658961881² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9658961801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4829480940 + 4829480941.

It is an arithmetic number, because the mean of its divisors is an integer number (4829480941).

Almost surely, 2^9658961881 is an apocalyptic number.

It is an amenable number.

9658961881 is a deficient number, since it is larger than the sum of its proper divisors (1).

9658961881 is an equidigital number, since it uses as much as digits as its factorization.

9658961881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7464960, while the sum is 61.

The square root of 9658961881 is about 98280.0177096036. The cubic root of 9658961881 is about 2129.6593958965.

The spelling of 9658961881 in words is "nine billion, six hundred fifty-eight million, nine hundred sixty-one thousand, eight hundred eighty-one".