16551206280 has 1152 divisors, whose sum is σ = 71705088000. Its totient is φ = 3409620480.

The previous prime is 16551206267. The next prime is 16551206303. The reversal of 16551206280 is 8260215561.

16551206280 is a `hidden beast` number, since 1 + 6 + 5 + 5 + 1 + 20 + 628 + 0 = 666.

It is a super-2 number, since 2×16551206280² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 280528891 + ... + 280528949.

It is an arithmetic number, because the mean of its divisors is an integer number (62244000).

Almost surely, 2^16551206280 is an apocalyptic number.

16551206280 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 16551206280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35852544000).

16551206280 is an abundant number, since it is smaller than the sum of its proper divisors (55153881720).

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

16551206280 is a wasteful number, since it uses less digits than its factorization.

16551206280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The spelling of 16551206280 in words is "sixteen billion, five hundred fifty-one million, two hundred six thousand, two hundred eighty".