16861899280 has 80 divisors (see below), whose sum is σ = 39647462400. Its totient is φ = 6668665344.

The previous prime is 16861899253. The next prime is 16861899283. The reversal of 16861899280 is 8299816861.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (16861899283) 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, 7027521 + ... + 7029919.

It is an arithmetic number, because the mean of its divisors is an integer number (495593280).

Almost surely, 2^16861899280 is an apocalyptic number.

16861899280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16861899280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19823731200).

16861899280 is an abundant number, since it is smaller than the sum of its proper divisors (22785563120).

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

16861899280 is a wasteful number, since it uses less digits than its factorization.

16861899280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3368 (or 3362 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 58.

The spelling of 16861899280 in words is "sixteen billion, eight hundred sixty-one million, eight hundred ninety-nine thousand, two hundred eighty".