9910665761 has 2 divisors, whose sum is σ = 9910665762. Its totient is φ = 9910665760.

The previous prime is 9910665719. The next prime is 9910665767. The reversal of 9910665761 is 1675660199.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5639259025 + 4271406736 = 75095^2 + 65356^2 .

It is a cyclic number.

It is not a de Polignac number, because 9910665761 - 2¹⁸ = 9910403617 is a prime.

It is not a weakly prime, because it can be changed into another prime (9910665767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4955332880 + 4955332881.

It is an arithmetic number, because the mean of its divisors is an integer number (4955332881).

Almost surely, 2^9910665761 is an apocalyptic number.

It is an amenable number.

9910665761 is a deficient number, since it is larger than the sum of its proper divisors (1).

9910665761 is an equidigital number, since it uses as much as digits as its factorization.

9910665761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 612360, while the sum is 50.

The square root of 9910665761 is about 99552.3267482986. The cubic root of 9910665761 is about 2147.9999977604. Note that the first 5 decimals are identical.

The spelling of 9910665761 in words is "nine billion, nine hundred ten million, six hundred sixty-five thousand, seven hundred sixty-one".