816606225 has 96 divisors (see below), whose sum is σ = 1618646400. Its totient is φ = 402278400.

The previous prime is 816606223. The next prime is 816606227. The reversal of 816606225 is 522606618.

It is an interprime number because it is at equal distance from previous prime (816606223) and next prime (816606227).

It is not a de Polignac number, because 816606225 - 2¹ = 816606223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 816606225.

It is not an unprimeable number, because it can be changed into a prime (816606221) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 525049 + ... + 526601.

It is an arithmetic number, because the mean of its divisors is an integer number (16860900).

Almost surely, 2^816606225 is an apocalyptic number.

It is an amenable number.

816606225 is a deficient number, since it is larger than the sum of its proper divisors (802040175).

816606225 is a wasteful number, since it uses less digits than its factorization.

816606225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632 (or 1621 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 816606225 is about 28576.3228040278. The cubic root of 816606225 is about 934.6971003552.

The spelling of 816606225 in words is "eight hundred sixteen million, six hundred six thousand, two hundred twenty-five".