16720516456 has 64 divisors (see below), whose sum is σ = 36469440000. Its totient is φ = 7038202560.

The previous prime is 16720516429. The next prime is 16720516459. The reversal of 16720516456 is 65461502761.

It is not an unprimeable number, because it can be changed into a prime (16720516459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6933891 + ... + 6936301.

It is an arithmetic number, because the mean of its divisors is an integer number (569835000).

Almost surely, 2^16720516456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16720516456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18234720000).

16720516456 is an abundant number, since it is smaller than the sum of its proper divisors (19748923544).

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

16720516456 is a wasteful number, since it uses less digits than its factorization.

16720516456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4582 (or 4578 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 16720516456 in words is "sixteen billion, seven hundred twenty million, five hundred sixteen thousand, four hundred fifty-six".