16503525521 has 16 divisors (see below), whose sum is σ = 19598573568. Its totient is φ = 13598874000.

The previous prime is 16503525503. The next prime is 16503525551. The reversal of 16503525521 is 12552530561.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16503525521 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16503525551) 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, 219065 + ... + 284598.

It is an arithmetic number, because the mean of its divisors is an integer number (1224910848).

Almost surely, 2^16503525521 is an apocalyptic number.

It is an amenable number.

16503525521 is a deficient number, since it is larger than the sum of its proper divisors (3095048047).

16503525521 is a wasteful number, since it uses less digits than its factorization.

16503525521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503852.

The product of its (nonzero) digits is 45000, while the sum is 35.

The spelling of 16503525521 in words is "sixteen billion, five hundred three million, five hundred twenty-five thousand, five hundred twenty-one".