673974644881 has 4 divisors (see below), whose sum is σ = 678267477172. Its totient is φ = 669681812592.

The previous prime is 673974644779. The next prime is 673974644911. The reversal of 673974644881 is 188446479376.

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

It can be written as a sum of positive squares in 2 ways, for example, as 121689345600 + 552285299281 = 348840^2 + 743159^2 .

It is a cyclic number.

It is not a de Polignac number, because 673974644881 - 2¹¹ = 673974642833 is a prime.

It is a super-2 number, since 2×673974644881² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (673974648881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2146415910 + ... + 2146416223.

It is an arithmetic number, because the mean of its divisors is an integer number (169566869293).

Almost surely, 2^673974644881 is an apocalyptic number.

It is an amenable number.

673974644881 is a deficient number, since it is larger than the sum of its proper divisors (4292832291).

673974644881 is a wasteful number, since it uses less digits than its factorization.

673974644881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4292832290.

The product of its digits is 195084288, while the sum is 67.

The spelling of 673974644881 in words is "six hundred seventy-three billion, nine hundred seventy-four million, six hundred forty-four thousand, eight hundred eighty-one".