9889217975961 has 16 divisors (see below), whose sum is σ = 14673478227520. Its totient is φ = 6582558765600.

The previous prime is 9889217975953. The next prime is 9889217975983. The reversal of 9889217975961 is 1695797129889.

It is a happy number.

9889217975961 is a `hidden beast` number, since 9 + 8 + 8 + 9 + 2 + 17 + 9 + 7 + 596 + 1 = 666.

9889217975961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9889217975961 - 2³ = 9889217975953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9889217975921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 284793940 + ... + 284828661.

It is an arithmetic number, because the mean of its divisors is an integer number (917092389220).

Almost surely, 2^{9889217975961} is an apocalyptic number.

It is an amenable number.

9889217975961 is a deficient number, since it is larger than the sum of its proper divisors (4784260251559).

9889217975961 is a wasteful number, since it uses less digits than its factorization.

9889217975961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569623253 (or 569623247 counting only the distinct ones).

The product of its digits is 1234517760, while the sum is 81.

The spelling of 9889217975961 in words is "nine trillion, eight hundred eighty-nine billion, two hundred seventeen million, nine hundred seventy-five thousand, nine hundred sixty-one".