684665193506 has 8 divisors (see below), whose sum is σ = 1173711760320. Its totient is φ = 293427940068.

The previous prime is 684665193479. The next prime is 684665193517. The reversal of 684665193506 is 605391566486.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24452328326 + ... + 24452328353.

It is an arithmetic number, because the mean of its divisors is an integer number (146713970040).

Almost surely, 2^684665193506 is an apocalyptic number.

684665193506 is a deficient number, since it is larger than the sum of its proper divisors (489046566814).

684665193506 is a wasteful number, since it uses less digits than its factorization.

684665193506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48904656688.

The product of its (nonzero) digits is 27993600, while the sum is 59.

The spelling of 684665193506 in words is "six hundred eighty-four billion, six hundred sixty-five million, one hundred ninety-three thousand, five hundred six".