9961798013 has 4 divisors (see below), whose sum is σ = 10283146368. Its totient is φ = 9640449660.

The previous prime is 9961797959. The next prime is 9961798027. The reversal of 9961798013 is 3108971699.

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 9961798013 - 2²⁴ = 9945020797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9961798073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160674131 + ... + 160674192.

It is an arithmetic number, because the mean of its divisors is an integer number (2570786592).

Almost surely, 2^9961798013 is an apocalyptic number.

It is an amenable number.

9961798013 is a deficient number, since it is larger than the sum of its proper divisors (321348355).

9961798013 is a wasteful number, since it uses less digits than its factorization.

9961798013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321348354.

The product of its (nonzero) digits is 734832, while the sum is 53.

The square root of 9961798013 is about 99808.8072917415. The cubic root of 9961798013 is about 2151.6877328819.

The spelling of 9961798013 in words is "nine billion, nine hundred sixty-one million, seven hundred ninety-eight thousand, thirteen".