9503985561 has 12 divisors (see below), whose sum is σ = 14740875792. Its totient is φ = 5430848808.

The previous prime is 9503985553. The next prime is 9503985593. The reversal of 9503985561 is 1655893059.

It is not a de Polignac number, because 9503985561 - 2³ = 9503985553 is a prime.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9503985551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32326335 + ... + 32326628.

It is an arithmetic number, because the mean of its divisors is an integer number (1228406316).

Almost surely, 2^9503985561 is an apocalyptic number.

It is an amenable number.

9503985561 is a deficient number, since it is larger than the sum of its proper divisors (5236890231).

9503985561 is a wasteful number, since it uses less digits than its factorization.

9503985561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64652980 (or 64652973 counting only the distinct ones).

The product of its (nonzero) digits is 1458000, while the sum is 51.

The square root of 9503985561 is about 97488.3868006851. The cubic root of 9503985561 is about 2118.2079284952.

The spelling of 9503985561 in words is "nine billion, five hundred three million, nine hundred eighty-five thousand, five hundred sixty-one".