16720356023523 has 12 divisors (see below), whose sum is σ = 24165355705920. Its totient is φ = 11140566936336.

The previous prime is 16720356023453. The next prime is 16720356023557. The reversal of 16720356023523 is 32532065302761.

16720356023523 is a `hidden beast` number, since 1 + 6 + 7 + 2 + 0 + 3 + 5 + 602 + 35 + 2 + 3 = 666.

16720356023523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16720356023523 - 2¹⁷ = 16720355892451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16720356523523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 528073236 + ... + 528104897.

It is an arithmetic number, because the mean of its divisors is an integer number (2013779642160).

Almost surely, 2^{16720356023523} is an apocalyptic number.

16720356023523 is a deficient number, since it is larger than the sum of its proper divisors (7444999682397).

16720356023523 is a wasteful number, since it uses less digits than its factorization.

16720356023523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056179898 (or 1056179895 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 45.

The spelling of 16720356023523 in words is "sixteen trillion, seven hundred twenty billion, three hundred fifty-six million, twenty-three thousand, five hundred twenty-three".