684666355 has 8 divisors (see below), whose sum is σ = 821831472. Its totient is φ = 547578528.

The previous prime is 684666331. The next prime is 684666361. The reversal of 684666355 is 553666486.

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

It is a cyclic number.

It is not a de Polignac number, because 684666355 - 2¹⁷ = 684535283 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 684666299 and 684666308.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2389 + ... + 37081.

It is an arithmetic number, because the mean of its divisors is an integer number (102728934).

Almost surely, 2^684666355 is an apocalyptic number.

684666355 is a deficient number, since it is larger than the sum of its proper divisors (137165117).

684666355 is a wasteful number, since it uses less digits than its factorization.

684666355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38645.

The product of its digits is 3110400, while the sum is 49.

The square root of 684666355 is about 26166.1299201850. The cubic root of 684666355 is about 881.3728378304.

The spelling of 684666355 in words is "six hundred eighty-four million, six hundred sixty-six thousand, three hundred fifty-five".