816216516 has 36 divisors (see below), whose sum is σ = 2171806000. Its totient is φ = 257752368.

The previous prime is 816216503. The next prime is 816216587. The reversal of 816216516 is 615612618.

816216516 is a `hidden beast` number, since 81 + 62 + 1 + 6 + 516 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 595966 + ... + 597333.

Almost surely, 2^816216516 is an apocalyptic number.

It is an amenable number.

816216516 is an abundant number, since it is smaller than the sum of its proper divisors (1355589484).

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

816216516 is a wasteful number, since it uses less digits than its factorization.

816216516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1193328 (or 1193323 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 816216516 is about 28569.5032508442. The cubic root of 816216516 is about 934.5483881927.

The spelling of 816216516 in words is "eight hundred sixteen million, two hundred sixteen thousand, five hundred sixteen".