9999481661777 has 2 divisors, whose sum is σ = 9999481661778. Its totient is φ = 9999481661776.

The previous prime is 9999481661713. The next prime is 9999481661803. The reversal of 9999481661777 is 7771661849999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9138958271041 + 860523390736 = 3023071^2 + 927644^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999481661777 - 2⁶ = 9999481661713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9999481661695 and 9999481661704.

It is not a weakly prime, because it can be changed into another prime (9999481661077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999740830888 + 4999740830889.

It is an arithmetic number, because the mean of its divisors is an integer number (4999740830889).

Almost surely, 2^{9999481661777} is an apocalyptic number.

It is an amenable number.

9999481661777 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999481661777 is an equidigital number, since it uses as much as digits as its factorization.

9999481661777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592487296, while the sum is 83.

The spelling of 9999481661777 in words is "nine trillion, nine hundred ninety-nine billion, four hundred eighty-one million, six hundred sixty-one thousand, seven hundred seventy-seven".