9999481661775 has 36 divisors (see below), whose sum is σ = 18527775229080. Its totient is φ = 5149158369600.

The previous prime is 9999481661713. The next prime is 9999481661777. The reversal of 9999481661775 is 5771661849999.

9999481661775 is a `hidden beast` number, since 9 + 9 + 9 + 9 + 481 + 6 + 61 + 7 + 75 = 666.

9999481661775 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9999481661775 - 2⁷ = 9999481661647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9999481661694 and 9999481661703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999481661777) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 766237281 + ... + 766250330.

It is an arithmetic number, because the mean of its divisors is an integer number (514660423030).

Almost surely, 2^{9999481661775} is an apocalyptic number.

9999481661775 is a deficient number, since it is larger than the sum of its proper divisors (8528293567305).

9999481661775 is a wasteful number, since it uses less digits than its factorization.

9999481661775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532487656 (or 1532487648 counting only the distinct ones).

The product of its digits is 1851776640, while the sum is 81.

The spelling of 9999481661775 in words is "nine trillion, nine hundred ninety-nine billion, four hundred eighty-one million, six hundred sixty-one thousand, seven hundred seventy-five".