16520210561223 has 48 divisors (see below), whose sum is σ = 25064440727040. Its totient is φ = 10465230105792.

The previous prime is 16520210561221. The next prime is 16520210561249. The reversal of 16520210561223 is 32216501202561.

16520210561223 is a `hidden beast` number, since 1 + 6 + 5 + 2 + 0 + 2 + 10 + 5 + 612 + 23 = 666.

It is not a de Polignac number, because 16520210561223 - 2¹ = 16520210561221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16520210561221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26565990 + ... + 27180732.

It is an arithmetic number, because the mean of its divisors is an integer number (522175848480).

Almost surely, 2^{16520210561223} is an apocalyptic number.

16520210561223 is a deficient number, since it is larger than the sum of its proper divisors (8544230165817).

16520210561223 is a wasteful number, since it uses less digits than its factorization.

16520210561223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615628 (or 615625 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

Adding to 16520210561223 its reverse (32216501202561), we get a palindrome (48736711763784).

The spelling of 16520210561223 in words is "sixteen trillion, five hundred twenty billion, two hundred ten million, five hundred sixty-one thousand, two hundred twenty-three".