16501214225 has 6 divisors (see below), whose sum is σ = 20461505670. Its totient is φ = 13200971360.

The previous prime is 16501214179. The next prime is 16501214239. The reversal of 16501214225 is 52241210561.

It can be written as a sum of positive squares in 3 ways, for example, as 1456719889 + 15044494336 = 38167^2 + 122656^2 .

It is not a de Polignac number, because 16501214225 - 2⁸ = 16501213969 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 330024260 + ... + 330024309.

It is an arithmetic number, because the mean of its divisors is an integer number (3410250945).

Almost surely, 2^16501214225 is an apocalyptic number.

It is an amenable number.

16501214225 is a deficient number, since it is larger than the sum of its proper divisors (3960291445).

16501214225 is an equidigital number, since it uses as much as digits as its factorization.

16501214225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660048579 (or 660048574 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 16501214225 its reverse (52241210561), we get a palindrome (68742424786).

The spelling of 16501214225 in words is "sixteen billion, five hundred one million, two hundred fourteen thousand, two hundred twenty-five".