9963750850561 has 4 divisors (see below), whose sum is σ = 9963757305792. Its totient is φ = 9963744395332.

The previous prime is 9963750850523. The next prime is 9963750850601. The reversal of 9963750850561 is 1650580573699.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 9963750850561 - 2⁷ = 9963750850433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9963750850493 and 9963750850502.

It is not an unprimeable number, because it can be changed into a prime (9963750850511) 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, 603396 + ... + 4504618.

It is an arithmetic number, because the mean of its divisors is an integer number (2490939326448).

Almost surely, 2^{9963750850561} is an apocalyptic number.

It is an amenable number.

9963750850561 is a deficient number, since it is larger than the sum of its proper divisors (6455231).

9963750850561 is a wasteful number, since it uses less digits than its factorization.

9963750850561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6455230.

The product of its (nonzero) digits is 61236000, while the sum is 64.

The spelling of 9963750850561 in words is "nine trillion, nine hundred sixty-three billion, seven hundred fifty million, eight hundred fifty thousand, five hundred sixty-one".