816649018 has 8 divisors (see below), whose sum is σ = 1226178720. Its totient is φ = 407922780.

The previous prime is 816648979. The next prime is 816649033. The reversal of 816649018 is 810946618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198318 + ... + 202393.

It is an arithmetic number, because the mean of its divisors is an integer number (153272340).

Almost surely, 2^816649018 is an apocalyptic number.

816649018 is a deficient number, since it is larger than the sum of its proper divisors (409529702).

816649018 is a wasteful number, since it uses less digits than its factorization.

816649018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401732.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 816649018 is about 28577.0715434595. The cubic root of 816649018 is about 934.7134271939.

The spelling of 816649018 in words is "eight hundred sixteen million, six hundred forty-nine thousand, eighteen".