683340166721 has 2 divisors, whose sum is σ = 683340166722. Its totient is φ = 683340166720.

The previous prime is 683340166687. The next prime is 683340166787. The reversal of 683340166721 is 127661043386.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 651634803121 + 31705363600 = 807239^2 + 178060^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-683340166721 is a prime.

It is not a weakly prime, because it can be changed into another prime (683340162721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 341670083360 + 341670083361.

It is an arithmetic number, because the mean of its divisors is an integer number (341670083361).

Almost surely, 2^683340166721 is an apocalyptic number.

It is an amenable number.

683340166721 is a deficient number, since it is larger than the sum of its proper divisors (1).

683340166721 is an equidigital number, since it uses as much as digits as its factorization.

683340166721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 47.

The spelling of 683340166721 in words is "six hundred eighty-three billion, three hundred forty million, one hundred sixty-six thousand, seven hundred twenty-one".