816585918 has 16 divisors (see below), whose sum is σ = 1634723856. Its totient is φ = 271936640.

The previous prime is 816585877. The next prime is 816585919. The reversal of 816585918 is 819585618.

816585918 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×816585918² = 1333625122951805448, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816585919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57771 + ... + 70502.

It is an arithmetic number, because the mean of its divisors is an integer number (102170241).

Almost surely, 2^816585918 is an apocalyptic number.

816585918 is an abundant number, since it is smaller than the sum of its proper divisors (818137938).

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

816585918 is a wasteful number, since it uses less digits than its factorization.

816585918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129339.

The product of its digits is 691200, while the sum is 51.

The square root of 816585918 is about 28575.9674901831. The cubic root of 816585918 is about 934.6893524139.

The spelling of 816585918 in words is "eight hundred sixteen million, five hundred eighty-five thousand, nine hundred eighteen".