684937484491 has 64 divisors (see below), whose sum is σ = 796020628480. Its totient is φ = 584103260160.

The previous prime is 684937484459. The next prime is 684937484501. The reversal of 684937484491 is 194484739486.

It is a 12-Lehmer number, since φ(684937484491) divides (684937484491-1)¹².

It is a cyclic number.

It is not a de Polignac number, because 684937484491 - 2⁵ = 684937484459 is a prime.

It is the 827610-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684937484591) by changing a digit.

It is a nontrivial repunit in base 827609.

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 63 ways as a sum of consecutive naturals, for example, 708311290 + ... + 708312256.

It is an arithmetic number, because the mean of its divisors is an integer number (12437822320).

Almost surely, 2^684937484491 is an apocalyptic number.

684937484491 is a deficient number, since it is larger than the sum of its proper divisors (111083143989).

684937484491 is a wasteful number, since it uses less digits than its factorization.

684937484491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1476.

The product of its digits is 167215104, while the sum is 67.

The spelling of 684937484491 in words is "six hundred eighty-four billion, nine hundred thirty-seven million, four hundred eighty-four thousand, four hundred ninety-one".