673121656 has 16 divisors (see below), whose sum is σ = 1291455000. Its totient is φ = 328733664.

The previous prime is 673121653. The next prime is 673121663. The reversal of 673121656 is 656121376.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673121651) 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, 978031 + ... + 978718.

Almost surely, 2^673121656 is an apocalyptic number.

It is an amenable number.

673121656 is a deficient number, since it is larger than the sum of its proper divisors (618333344).

673121656 is a wasteful number, since it uses less digits than its factorization.

673121656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1956798 (or 1956794 counting only the distinct ones).

The product of its digits is 45360, while the sum is 37.

The square root of 673121656 is about 25944.5881832802. The cubic root of 673121656 is about 876.3908898182.

The spelling of 673121656 in words is "six hundred seventy-three million, one hundred twenty-one thousand, six hundred fifty-six".