9802561866 has 32 divisors (see below), whose sum is σ = 20482979328. Its totient is φ = 3121565040.

The previous prime is 9802561729. The next prime is 9802561877. The reversal of 9802561866 is 6681652089.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68125 + ... + 155711.

It is an arithmetic number, because the mean of its divisors is an integer number (640093104).

Almost surely, 2^9802561866 is an apocalyptic number.

9802561866 is an abundant number, since it is smaller than the sum of its proper divisors (10680417462).

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

9802561866 is a wasteful number, since it uses less digits than its factorization.

9802561866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88426.

The product of its (nonzero) digits is 1244160, while the sum is 51.

The square root of 9802561866 is about 99007.8878978842. The cubic root of 9802561866 is about 2140.1614186622.

The spelling of 9802561866 in words is "nine billion, eight hundred two million, five hundred sixty-one thousand, eight hundred sixty-six".