16720516451 has 16 divisors (see below), whose sum is σ = 16937760000. Its totient is φ = 16505162208.

The previous prime is 16720516429. The next prime is 16720516459. The reversal of 16720516451 is 15461502761.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16720516451 is a prime.

It is a Duffinian number.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23582885 + ... + 23583593.

It is an arithmetic number, because the mean of its divisors is an integer number (1058610000).

Almost surely, 2^16720516451 is an apocalyptic number.

16720516451 is a deficient number, since it is larger than the sum of its proper divisors (217243549).

16720516451 is a wasteful number, since it uses less digits than its factorization.

16720516451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1658.

The product of its (nonzero) digits is 50400, while the sum is 38.

The spelling of 16720516451 in words is "sixteen billion, seven hundred twenty million, five hundred sixteen thousand, four hundred fifty-one".