9920756669 has 2 divisors, whose sum is σ = 9920756670. Its totient is φ = 9920756668.

The previous prime is 9920756647. The next prime is 9920756689. The reversal of 9920756669 is 9666570299.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9919164025 + 1592644 = 99595^2 + 1262^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9920756669 is a prime.

It is a super-2 number, since 2×9920756669² (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 (9920756689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4960378334 + 4960378335.

It is an arithmetic number, because the mean of its divisors is an integer number (4960378335).

Almost surely, 2^9920756669 is an apocalyptic number.

It is an amenable number.

9920756669 is a deficient number, since it is larger than the sum of its proper divisors (1).

9920756669 is an equidigital number, since it uses as much as digits as its factorization.

9920756669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11022480, while the sum is 59.

The square root of 9920756669 is about 99602.9952812665. The cubic root of 9920756669 is about 2148.7287721452.

The spelling of 9920756669 in words is "nine billion, nine hundred twenty million, seven hundred fifty-six thousand, six hundred sixty-nine".