16520205001 has 4 divisors (see below), whose sum is σ = 16729321600. Its totient is φ = 16311088404.

The previous prime is 16520204983. The next prime is 16520205007. The reversal of 16520205001 is 10050202561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16520205001 - 2¹¹ = 16520202953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16520205007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104558181 + ... + 104558338.

It is an arithmetic number, because the mean of its divisors is an integer number (4182330400).

Almost surely, 2^16520205001 is an apocalyptic number.

It is an amenable number.

16520205001 is a deficient number, since it is larger than the sum of its proper divisors (209116599).

16520205001 is an equidigital number, since it uses as much as digits as its factorization.

16520205001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209116598.

The product of its (nonzero) digits is 600, while the sum is 22.

Adding to 16520205001 its reverse (10050202561), we get a palindrome (26570407562).

The spelling of 16520205001 in words is "sixteen billion, five hundred twenty million, two hundred five thousand, one".