816066386 has 4 divisors (see below), whose sum is σ = 1224099582. Its totient is φ = 408033192.

The previous prime is 816066353. The next prime is 816066389. The reversal of 816066386 is 683660618.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 603635761 + 212430625 = 24569^2 + 14575^2 .

It is not an unprimeable number, because it can be changed into a prime (816066389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204016595 + ... + 204016598.

Almost surely, 2^816066386 is an apocalyptic number.

816066386 is a deficient number, since it is larger than the sum of its proper divisors (408033196).

816066386 is a wasteful number, since it uses less digits than its factorization.

816066386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408033195.

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 816066386 is about 28566.8756779596. The cubic root of 816066386 is about 934.4910862596.

The spelling of 816066386 in words is "eight hundred sixteen million, sixty-six thousand, three hundred eighty-six".