816512275 has 6 divisors (see below), whose sum is σ = 1012475252. Its totient is φ = 653209800.

The previous prime is 816512273. The next prime is 816512309. The reversal of 816512275 is 572215618.

It is not a de Polignac number, because 816512275 - 2¹ = 816512273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816512273) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16330221 + ... + 16330270.

Almost surely, 2^816512275 is an apocalyptic number.

816512275 is a deficient number, since it is larger than the sum of its proper divisors (195962977).

816512275 is a wasteful number, since it uses less digits than its factorization.

816512275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32660501 (or 32660496 counting only the distinct ones).

The product of its digits is 33600, while the sum is 37.

The square root of 816512275 is about 28574.6789133316. The cubic root of 816512275 is about 934.6612535551.

The spelling of 816512275 in words is "eight hundred sixteen million, five hundred twelve thousand, two hundred seventy-five".