816654673 has 4 divisors (see below), whose sum is σ = 817742848. Its totient is φ = 815566500.

The previous prime is 816654647. The next prime is 816654697. The reversal of 816654673 is 376456618.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 376456618 = 2 ⋅188228309.

It is a cyclic number.

It is not a de Polignac number, because 816654673 - 2²⁹ = 279783761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816654623) 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, 542961 + ... + 544462.

It is an arithmetic number, because the mean of its divisors is an integer number (204435712).

Almost surely, 2^816654673 is an apocalyptic number.

It is an amenable number.

816654673 is a deficient number, since it is larger than the sum of its proper divisors (1088175).

816654673 is a wasteful number, since it uses less digits than its factorization.

816654673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088174.

The product of its digits is 725760, while the sum is 46.

The square root of 816654673 is about 28577.1704862465. The cubic root of 816654673 is about 934.7155847068.

The spelling of 816654673 in words is "eight hundred sixteen million, six hundred fifty-four thousand, six hundred seventy-three".