16520215613 has 16 divisors (see below), whose sum is σ = 19120219776. Its totient is φ = 14106762240.

The previous prime is 16520215601. The next prime is 16520215619. The reversal of 16520215613 is 31651202561.

It is a cyclic number.

It is not a de Polignac number, because 16520215613 - 2¹⁸ = 16519953469 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16520215613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16520215619) 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, 6245 + ... + 181877.

It is an arithmetic number, because the mean of its divisors is an integer number (1195013736).

Almost surely, 2^16520215613 is an apocalyptic number.

It is an amenable number.

16520215613 is a deficient number, since it is larger than the sum of its proper divisors (2600004163).

16520215613 is a wasteful number, since it uses less digits than its factorization.

16520215613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176164.

The product of its (nonzero) digits is 10800, while the sum is 32.

The spelling of 16520215613 in words is "sixteen billion, five hundred twenty million, two hundred fifteen thousand, six hundred thirteen".