16520426523 has 10 divisors (see below), whose sum is σ = 24678661964. Its totient is φ = 11013617628.

The previous prime is 16520426519. The next prime is 16520426537. The reversal of 16520426523 is 32562402561.

16520426523 is a `hidden beast` number, since 16 + 520 + 42 + 65 + 23 = 666.

It is not a de Polignac number, because 16520426523 - 2² = 16520426519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16520426513) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 101977861 + ... + 101978022.

Almost surely, 2^16520426523 is an apocalyptic number.

16520426523 is a deficient number, since it is larger than the sum of its proper divisors (8158235441).

16520426523 is an equidigital number, since it uses as much as digits as its factorization.

16520426523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203955895 (or 203955886 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 16520426523 in words is "sixteen billion, five hundred twenty million, four hundred twenty-six thousand, five hundred twenty-three".