16520647680 has 352 divisors, whose sum is σ = 59236577280. Its totient is φ = 4366172160.

The previous prime is 16520647679. The next prime is 16520647691. The reversal of 16520647680 is 8674602561.

16520647680 is a `hidden beast` number, since 1 + 6 + 520 + 6 + 47 + 6 + 80 = 666.

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

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 17556010 + ... + 17556950.

Almost surely, 2^16520647680 is an apocalyptic number.

16520647680 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 16520647680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29618288640).

16520647680 is an abundant number, since it is smaller than the sum of its proper divisors (42715929600).

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

16520647680 is a wasteful number, since it uses less digits than its factorization.

16520647680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102 (or 1078 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 16520647680 in words is "sixteen billion, five hundred twenty million, six hundred forty-seven thousand, six hundred eighty".