298889685666 has 128 divisors (see below), whose sum is σ = 782866022400. Its totient is φ = 83332514880.

The previous prime is 298889685631. The next prime is 298889685709. The reversal of 298889685666 is 666586988892.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2307615 + ... + 2433693.

It is an arithmetic number, because the mean of its divisors is an integer number (6116140800).

Almost surely, 2^298889685666 is an apocalyptic number.

298889685666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 298889685666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (391433011200).

298889685666 is an abundant number, since it is smaller than the sum of its proper divisors (483976336734).

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

298889685666 is a wasteful number, since it uses less digits than its factorization.

298889685666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126421 (or 126415 counting only the distinct ones).

The product of its digits is 4299816960, while the sum is 81.

The spelling of 298889685666 in words is "two hundred ninety-eight billion, eight hundred eighty-nine million, six hundred eighty-five thousand, six hundred sixty-six".