9945558780965 has 8 divisors (see below), whose sum is σ = 11934721455000. Its totient is φ = 7956413079552.

The previous prime is 9945558780961. The next prime is 9945558780967. The reversal of 9945558780965 is 5690878555499.

It is a Cunningham number, because it is equal to 3153658²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 9945558780964 = 1^2 + 3153658^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9945558780965 - 2² = 9945558780961 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9945558780965.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9945558780961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2916284 + ... + 5328773.

It is an arithmetic number, because the mean of its divisors is an integer number (1491840181875).

Almost surely, 2^{9945558780965} is an apocalyptic number.

It is an amenable number.

9945558780965 is a deficient number, since it is larger than the sum of its proper divisors (1989162674035).

9945558780965 is a wasteful number, since it uses less digits than its factorization.

9945558780965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8486311.

The product of its (nonzero) digits is 4898880000, while the sum is 80.

The spelling of 9945558780965 in words is "nine trillion, nine hundred forty-five billion, five hundred fifty-eight million, seven hundred eighty thousand, nine hundred sixty-five".