816605718 has 8 divisors (see below), whose sum is σ = 1633211448. Its totient is φ = 272201904.

The previous prime is 816605717. The next prime is 816605723. The reversal of 816605718 is 817506618.

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

816605718 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 816605718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816605717) 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 in 3 ways as a sum of consecutive naturals, for example, 68050471 + ... + 68050482.

It is an arithmetic number, because the mean of its divisors is an integer number (204151431).

Almost surely, 2^816605718 is an apocalyptic number.

816605718 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

816605718 is a wasteful number, since it uses less digits than its factorization.

816605718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136100958.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 816605718 is about 28576.3139330460. The cubic root of 816605718 is about 934.6969069158.

It can be divided in two parts, 81660 and 5718, that added together give a palindrome (87378).

The spelling of 816605718 in words is "eight hundred sixteen million, six hundred five thousand, seven hundred eighteen".