16520356135 has 16 divisors (see below), whose sum is σ = 21096072000. Its totient is φ = 12376336896.

The previous prime is 16520356129. The next prime is 16520356163. The reversal of 16520356135 is 53165302561.

It is a cyclic number.

It is not a de Polignac number, because 16520356135 - 2¹⁹ = 16519831847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16520356094 and 16520356103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 471420 + ... + 505249.

It is an arithmetic number, because the mean of its divisors is an integer number (1318504500).

Almost surely, 2^16520356135 is an apocalyptic number.

16520356135 is a deficient number, since it is larger than the sum of its proper divisors (4575715865).

16520356135 is a wasteful number, since it uses less digits than its factorization.

16520356135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976890.

The product of its (nonzero) digits is 81000, while the sum is 37.

Adding to 16520356135 its reverse (53165302561), we get a palindrome (69685658696).

The spelling of 16520356135 in words is "sixteen billion, five hundred twenty million, three hundred fifty-six thousand, one hundred thirty-five".