9909425509777 has 4 divisors (see below), whose sum is σ = 9940685527476. Its totient is φ = 9878165492080.

The previous prime is 9909425509769. The next prime is 9909425509783. The reversal of 9909425509777 is 7779055249099.

It is a Cunningham number, because it is equal to 3147924²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 554691290176 + 9354734219601 = 744776^2 + 3058551^2 .

It is a cyclic number.

It is not a de Polignac number, because 9909425509777 - 2³ = 9909425509769 is a prime.

It is a super-3 number, since 3×9909425509777³ (a number of 40 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9909425509747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15630008374 + ... + 15630009007.

It is an arithmetic number, because the mean of its divisors is an integer number (2485171381869).

Almost surely, 2^{9909425509777} is an apocalyptic number.

It is an amenable number.

9909425509777 is a deficient number, since it is larger than the sum of its proper divisors (31260017699).

9909425509777 is a wasteful number, since it uses less digits than its factorization.

9909425509777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31260017698.

The product of its (nonzero) digits is 450084600, while the sum is 73.

The spelling of 9909425509777 in words is "nine trillion, nine hundred nine billion, four hundred twenty-five million, five hundred nine thousand, seven hundred seventy-seven".