673816651 has 4 divisors (see below), whose sum is σ = 695552704. Its totient is φ = 652080600.

The previous prime is 673816631. The next prime is 673816687. The reversal of 673816651 is 156618376.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 673816651 - 2²⁵ = 640262219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 673816598 and 673816607.

It is not an unprimeable number, because it can be changed into a prime (673816601) 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 3 ways as a sum of consecutive naturals, for example, 10867980 + ... + 10868041.

It is an arithmetic number, because the mean of its divisors is an integer number (173888176).

Almost surely, 2^673816651 is an apocalyptic number.

673816651 is a deficient number, since it is larger than the sum of its proper divisors (21736053).

673816651 is a wasteful number, since it uses less digits than its factorization.

673816651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21736052.

The product of its digits is 181440, while the sum is 43.

The square root of 673816651 is about 25957.9785615136. The cubic root of 673816651 is about 876.6924092511.

The spelling of 673816651 in words is "six hundred seventy-three million, eight hundred sixteen thousand, six hundred fifty-one".