16225561216 has 32 divisors (see below), whose sum is σ = 32541340500. Its totient is φ = 8058322944.

The previous prime is 16225561211. The next prime is 16225561223. The reversal of 16225561216 is 61216552261.

It can be written as a sum of positive squares in 2 ways, for example, as 16210382400 + 15178816 = 127320^2 + 3896^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (16225561211) 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, 406305 + ... + 444448.

Almost surely, 2^16225561216 is an apocalyptic number.

16225561216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16225561216 is an abundant number, since it is smaller than the sum of its proper divisors (16315779284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16225561216 is an equidigital number, since it uses as much as digits as its factorization.

16225561216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850916 (or 850904 counting only the distinct ones).

The product of its digits is 43200, while the sum is 37.

The spelling of 16225561216 in words is "sixteen billion, two hundred twenty-five million, five hundred sixty-one thousand, two hundred sixteen".