16505603213 has 8 divisors (see below), whose sum is σ = 18045008256. Its totient is φ = 14972680800.

The previous prime is 16505603197. The next prime is 16505603251. The reversal of 16505603213 is 31230650561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16505603213 - 2⁴ = 16505603197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16505603213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16505603293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1615328 + ... + 1625513.

It is an arithmetic number, because the mean of its divisors is an integer number (2255626032).

Almost surely, 2^16505603213 is an apocalyptic number.

It is an amenable number.

16505603213 is a deficient number, since it is larger than the sum of its proper divisors (1539405043).

16505603213 is a wasteful number, since it uses less digits than its factorization.

16505603213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3241315.

The product of its (nonzero) digits is 16200, while the sum is 32.

The spelling of 16505603213 in words is "sixteen billion, five hundred five million, six hundred three thousand, two hundred thirteen".