9766127821 has 2 divisors, whose sum is σ = 9766127822. Its totient is φ = 9766127820.

The previous prime is 9766127801. The next prime is 9766127831. The reversal of 9766127821 is 1287216679.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8664817225 + 1101310596 = 93085^2 + 33186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9766127821 is a prime.

It is a super-2 number, since 2×9766127821² (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 (9766127801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4883063910 + 4883063911.

It is an arithmetic number, because the mean of its divisors is an integer number (4883063911).

Almost surely, 2^9766127821 is an apocalyptic number.

It is an amenable number.

9766127821 is a deficient number, since it is larger than the sum of its proper divisors (1).

9766127821 is an equidigital number, since it uses as much as digits as its factorization.

9766127821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 49.

The square root of 9766127821 is about 98823.7209428991. The cubic root of 9766127821 is about 2137.5066180204.

The spelling of 9766127821 in words is "nine billion, seven hundred sixty-six million, one hundred twenty-seven thousand, eight hundred twenty-one".