9847987566 has 16 divisors (see below), whose sum is σ = 19702347600. Its totient is φ = 3281600448.

The previous prime is 9847987561. The next prime is 9847987601. The reversal of 9847987566 is 6657897489.

It is a self number, because there is not a number n which added to its sum of digits gives 9847987566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9847987561) 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, 245311 + ... + 282618.

It is an arithmetic number, because the mean of its divisors is an integer number (1231396725).

Almost surely, 2^9847987566 is an apocalyptic number.

9847987566 is an abundant number, since it is smaller than the sum of its proper divisors (9854360034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9847987566 is a wasteful number, since it uses less digits than its factorization.

9847987566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531043.

The product of its digits is 182891520, while the sum is 69.

The square root of 9847987566 is about 99237.0271924749. The cubic root of 9847987566 is about 2143.4622069430.

The spelling of 9847987566 in words is "nine billion, eight hundred forty-seven million, nine hundred eighty-seven thousand, five hundred sixty-six".