684611173387 has 2 divisors, whose sum is σ = 684611173388. Its totient is φ = 684611173386.

The previous prime is 684611173339. The next prime is 684611173501. The reversal of 684611173387 is 783371116486.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684611173387 is a prime.

It is not a weakly prime, because it can be changed into another prime (684611173327) by changing a digit.

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 as a sum of consecutive naturals, namely, 342305586693 + 342305586694.

It is an arithmetic number, because the mean of its divisors is an integer number (342305586694).

Almost surely, 2^684611173387 is an apocalyptic number.

684611173387 is a deficient number, since it is larger than the sum of its proper divisors (1).

684611173387 is an equidigital number, since it uses as much as digits as its factorization.

684611173387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 55.

The spelling of 684611173387 in words is "six hundred eighty-four billion, six hundred eleven million, one hundred seventy-three thousand, three hundred eighty-seven".