684611173402 has 8 divisors (see below), whose sum is σ = 1105910357076. Its totient is φ = 315974387712.

The previous prime is 684611173387. The next prime is 684611173501. The reversal of 684611173402 is 204371116486.

It can be written as a sum of positive squares in 2 ways, for example, as 676471705441 + 8139467961 = 822479^2 + 90219^2 .

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, 13165599463 + ... + 13165599514.

Almost surely, 2^684611173402 is an apocalyptic number.

684611173402 is a deficient number, since it is larger than the sum of its proper divisors (421299183674).

684611173402 is a wasteful number, since it uses less digits than its factorization.

684611173402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26331198992.

The product of its (nonzero) digits is 193536, while the sum is 43.

Adding to 684611173402 its reverse (204371116486), we get a palindrome (888982289888).

The spelling of 684611173402 in words is "six hundred eighty-four billion, six hundred eleven million, one hundred seventy-three thousand, four hundred two".