9966431477 has 2 divisors, whose sum is σ = 9966431478. Its totient is φ = 9966431476.

The previous prime is 9966431471. The next prime is 9966431533. The reversal of 9966431477 is 7741346699.

9966431477 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (9966431533) can be obtained adding 9966431477 to its sum of digits (56).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9961237636 + 5193841 = 99806^2 + 2279^2 .

It is an emirp because it is prime and its reverse (7741346699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9966431477 - 2¹² = 9966427381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9966431471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4983215738 + 4983215739.

It is an arithmetic number, because the mean of its divisors is an integer number (4983215739).

Almost surely, 2^9966431477 is an apocalyptic number.

It is an amenable number.

9966431477 is a deficient number, since it is larger than the sum of its proper divisors (1).

9966431477 is an equidigital number, since it uses as much as digits as its factorization.

9966431477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6858432, while the sum is 56.

The square root of 9966431477 is about 99832.0162923699. The cubic root of 9966431477 is about 2152.0212811802.

The spelling of 9966431477 in words is "nine billion, nine hundred sixty-six million, four hundred thirty-one thousand, four hundred seventy-seven".