16551521280 has 792 divisors, whose sum is σ = 69223513632. Its totient is φ = 3581411328.

The previous prime is 16551521263. The next prime is 16551521297. The reversal of 16551521280 is 8212515561.

16551521280 is a `hidden beast` number, since 1 + 6 + 5 + 51 + 521 + 2 + 80 = 666.

It is an interprime number because it is at equal distance from previous prime (16551521263) and next prime (16551521297).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 170634192 + ... + 170634288.

Almost surely, 2^16551521280 is an apocalyptic number.

16551521280 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 16551521280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34611756816).

16551521280 is an abundant number, since it is smaller than the sum of its proper divisors (52671992352).

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

16551521280 is a wasteful number, since it uses less digits than its factorization.

16551521280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 36.

The spelling of 16551521280 in words is "sixteen billion, five hundred fifty-one million, five hundred twenty-one thousand, two hundred eighty".