9961535563 has 4 divisors (see below), whose sum is σ = 11384612080. Its totient is φ = 8538459048.

The previous prime is 9961535561. The next prime is 9961535587. The reversal of 9961535563 is 3655351699.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3655351699 = 389 ⋅9396791.

It is not a de Polignac number, because 9961535563 - 2¹ = 9961535561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9961535563.

It is not an unprimeable number, because it can be changed into a prime (9961535561) 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, 711538248 + ... + 711538261.

It is an arithmetic number, because the mean of its divisors is an integer number (2846153020).

Almost surely, 2^9961535563 is an apocalyptic number.

9961535563 is a deficient number, since it is larger than the sum of its proper divisors (1423076517).

9961535563 is a wasteful number, since it uses less digits than its factorization.

9961535563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423076516.

The product of its digits is 3280500, while the sum is 52.

The square root of 9961535563 is about 99807.4925193495. The cubic root of 9961535563 is about 2151.6688368485.

The spelling of 9961535563 in words is "nine billion, nine hundred sixty-one million, five hundred thirty-five thousand, five hundred sixty-three".