684881577121 has 16 divisors (see below), whose sum is σ = 794883953664. Its totient is φ = 577987059024.

The previous prime is 684881577077. The next prime is 684881577137. The reversal of 684881577121 is 121775188486.

It is a cyclic number.

It is not a de Polignac number, because 684881577121 - 2²¹ = 684879479969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684881547121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2682805 + ... + 2926978.

It is an arithmetic number, because the mean of its divisors is an integer number (49680247104).

Almost surely, 2^684881577121 is an apocalyptic number.

It is an amenable number.

684881577121 is a deficient number, since it is larger than the sum of its proper divisors (110002376543).

684881577121 is a wasteful number, since it uses less digits than its factorization.

684881577121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5610060.

The product of its digits is 6021120, while the sum is 58.

The spelling of 684881577121 in words is "six hundred eighty-four billion, eight hundred eighty-one million, five hundred seventy-seven thousand, one hundred twenty-one".