16286561280 has 792 divisors, whose sum is σ = 65235695616. Its totient is φ = 3746856960.

The previous prime is 16286561279. The next prime is 16286561281. The reversal of 16286561280 is 8216568261.

16286561280 is a `hidden beast` number, since 1 + 6 + 2 + 8 + 6 + 561 + 2 + 80 = 666.

It is an interprime number because it is at equal distance from previous prime (16286561279) and next prime (16286561281).

It is a tau number, because it is divible by the number of its divisors (792).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16286561281) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 128240577 + ... + 128240703.

Almost surely, 2^16286561280 is an apocalyptic number.

16286561280 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 16286561280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32617847808).

16286561280 is an abundant number, since it is smaller than the sum of its proper divisors (48949134336).

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

16286561280 is a wasteful number, since it uses less digits than its factorization.

16286561280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203 (or 171 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 16286561280 in words is "sixteen billion, two hundred eighty-six million, five hundred sixty-one thousand, two hundred eighty".