816655 has 8 divisors (see below), whose sum is σ = 1120032. Its totient is φ = 559968.

The previous prime is 816653. The next prime is 816667. The reversal of 816655 is 556618.

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

It is a cyclic number.

It is not a de Polignac number, because 816655 - 2¹ = 816653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11632 + ... + 11701.

It is an arithmetic number, because the mean of its divisors is an integer number (140004).

2⁸¹⁶⁶⁵⁵ is an apocalyptic number.

816655 is a deficient number, since it is larger than the sum of its proper divisors (303377).

816655 is a wasteful number, since it uses less digits than its factorization.

816655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23345.

The product of its digits is 7200, while the sum is 31.

The square root of 816655 is about 903.6896591198. The cubic root of 816655 is about 93.4715709464.

The spelling of 816655 in words is "eight hundred sixteen thousand, six hundred fifty-five".