673939847521 has 4 divisors (see below), whose sum is σ = 676135091632. Its totient is φ = 671744603412.

The previous prime is 673939847519. The next prime is 673939847527. The reversal of 673939847521 is 125748939376.

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.

It is a cyclic number.

It is not a de Polignac number, because 673939847521 - 2¹ = 673939847519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (673939847527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1097621595 + ... + 1097622208.

It is an arithmetic number, because the mean of its divisors is an integer number (169033772908).

Almost surely, 2^673939847521 is an apocalyptic number.

It is an amenable number.

673939847521 is a deficient number, since it is larger than the sum of its proper divisors (2195244111).

673939847521 is a wasteful number, since it uses less digits than its factorization.

673939847521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2195244110.

The product of its digits is 68584320, while the sum is 64.

The spelling of 673939847521 in words is "six hundred seventy-three billion, nine hundred thirty-nine million, eight hundred forty-seven thousand, five hundred twenty-one".