9961915757 has 4 divisors (see below), whose sum is σ = 10014072576. Its totient is φ = 9909758940.

The previous prime is 9961915753. The next prime is 9961915763. The reversal of 9961915757 is 7575191699.

9961915757 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9961915757 - 2² = 9961915753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9961915696 and 9961915705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9961915753) 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 in 3 ways as a sum of consecutive naturals, for example, 26078123 + ... + 26078504.

It is an arithmetic number, because the mean of its divisors is an integer number (2503518144).

Almost surely, 2^9961915757 is an apocalyptic number.

It is an amenable number.

9961915757 is a deficient number, since it is larger than the sum of its proper divisors (52156819).

9961915757 is a wasteful number, since it uses less digits than its factorization.

9961915757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52156818.

The product of its digits is 5358150, while the sum is 59.

The square root of 9961915757 is about 99809.3971377445. The cubic root of 9961915757 is about 2151.6962101776.

The spelling of 9961915757 in words is "nine billion, nine hundred sixty-one million, nine hundred fifteen thousand, seven hundred fifty-seven".