684346643507 has 2 divisors, whose sum is σ = 684346643508. Its totient is φ = 684346643506.

The previous prime is 684346643479. The next prime is 684346643573. The reversal of 684346643507 is 705346643486.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 684346643507 - 2¹² = 684346639411 is a prime.

It is not a weakly prime, because it can be changed into another prime (684346633507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342173321753 + 342173321754.

It is an arithmetic number, because the mean of its divisors is an integer number (342173321754).

Almost surely, 2^684346643507 is an apocalyptic number.

684346643507 is a deficient number, since it is larger than the sum of its proper divisors (1).

684346643507 is an equidigital number, since it uses as much as digits as its factorization.

684346643507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34836480, while the sum is 56.

The spelling of 684346643507 in words is "six hundred eighty-four billion, three hundred forty-six million, six hundred forty-three thousand, five hundred seven".